Advancements and challenges in design of flow field plates in proton exchange membrane fuel cells: a comprehensive review

Abstract

Proton Exchange Membrane Fuel Cells (PEMFCs) have received increasing attention as a renewable energy technology with the potential to reduce greenhouse gas emissions and reduce reliance on fossil fuels. This review presents the advancements and challenges associated with flow field plates (FFPs) and cooling systems in PEMFC with a particular emphasis on the exploration and integration of bio-inspired designs which inspiration from natural structures offers unique solutions for uniformity of fuel and heat distribution. A comparative study on the innovative nature-inspired designs and conventional designs for FFPs and cooling systems is presented. Various fabrication methods of FFPs assessing their feasibility and economic implications are discussed. The comparative analysis aims to offer a holistic view on the current landscape and future directions in PEMFC technology, highlighting the importance of efficient design and manufacturing strategies to meet the growing demands for sustainable and efficient energy solutions.

1 Introduction

Fuel cell (FC) technology is a clean and efficient way to convert the chemical energy of fuels such as hydrogen, natural gas, methanol, and ethanol into electric energy with significantly high efficiency and much lower greenhouse-gas emission as compared to well-established internal combustion engine technologies. FCs can be categorized according to the nature of the electrolytes, including low-temperature Proton Exchange Membrane fuel cells PEMFCs, alkaline fuel cells (AFCs), phosphoric acid fuel cells (PAFCs) to high-temperature molten-carbonate fuel cells (MCFCs) and solid-oxide fuel cells (SOFCs) (see Figure 1) (Steele and Heinzel, 2001), (Mekhilef et al., 2012), (Ebrahimi et al., 2021), (Pan et al., 2024).

FIGURE 1

Ebrahimi et al., 2021), open access).

As shown in Figure 2, FCs are used in a variety of applications including primary and backup power for commercial, industrial, and residential buildings, as well as in remote or inaccessible areas. They are also used to power FC vehicles, including automobiles, buses, trains, boats, motorcycles, airplanes, submarines and drones (Sebbani et al., 2025), (Olabi et al., 2021).

FIGURE 2

As PEMFCs continue to gain attention as a clean energy solution, their significance is heightened by their utilisation of hydrogen as a fuel; this type of FC efficiently converts hydrogen into electricity. The components of PEMFC include (Figure 3a) the PEM, catalyst layer (CL), gas diffusion layer (GDL), FFPs for fuel delivery and charge collection, and the cooling system. The PEM with two CLs sandwiched between two GDLs form the membrane-electrode assembly (MEA). The electrochemical reactions occurring in PEMFC (Figure 3b) are as follows:

FIGURE 3

In this process, electrons flow from the anode to the cathode through an external circuit, generating electrical power, while protons move through the PEM to the cathode to complete the reaction, forming water as the only by-product. The heat produced in the chemical reactions Equations 1–3 is removed by a cooling system located outside the FC that prevents the MEA from overheating and further degradation.

The design and optimization of FFPs have become subjects of intense research and development. FFPs not only impact the overall performance of PEMFCs but also influence such factors such durability, cost-effectiveness, manufacturability, and lifespan. Consequently, a comprehensive understanding of FFP design principles, materials selection, manufacturing techniques, and their implications on PEMFC performance is essential to unlocking the full potential of this technology (Zhang et al., 2024; Wang and Jiang, 2017; Shekhawat et al., 2011; Chen et al., 2019).

The FFP is a very important multi-functional component of the FC; it supplies fuel (H₂) and oxidant (O₂ or air) to the MEA, removes water outside the FC, collects electrons produced in the system and carries the current from the MEA to the end plates of the PEMFC stack. The bipolar plates also serves as separators between two adjacent FCs and their connector in the PEMFC stack. Bipolar plates provide fast efficient removing the heat generated in the chemical reactions Equations 1–3 by conducting it away from the MEA. The FFPs comprise ∼50–60% of the weight, ∼50% of the volume, and ∼30–40% of the total cost of the FC stack (Figure 4) (Tang et al., 2021; Song et al., 2021). It plays a vital role in distributing reactants evenly across the cell to provide efficient electrochemical reactions and longevity time. Therefore, design optimization and improvement of operating conditions contributes significantly to reduction in both weight and price of FC stack.

FIGURE 4

Proper design and fabrication of FFPs in PEMFCs are important for optimal reactant transport, uniform gas distribution, low-pressure drop for fuel pumping, and timely water removal from the FC. All these factors highly determine the performance (i.e., resulting electric current at a given flow rate of the fuel) and efficiency (a ratio of the useful and applied energies) of the PEMFCs. Over the recent years, there has been an increased interest in optimizing the design and fabrication of FFPs for their better performance in PEMFCs. Researchers have considered various FFP designs for bipolar plates, such as serpentine, parallel, interdigitated, and mesh types or their combinations. Besides, 2D circular and 3D tubular geometry, porous, fractal, and biomimetic FFP designs, which facilitate gas distribution, control water management, and improve the overall performance of the PEMFC have been elaborated and tested. However, each design also comes with its cons and trade-offs, therefore making it difficult to select a single optimal FFP. Because of such challenges involved in the design and fabrication of FFPs, researchers have conducted a lot of studies in theoretical models, numerical simulations and experimental studies on different types of FFPs. They have figured out that proper design and fabrication of FFPs can greatly enhance the performance and efficiency, and decrease the overall cost of PEMFCs (Shaigan et al., 2021; Hermann et al., 2005; Dihrab et al., 2009; Mehta and Cooper, 2003).

During the last decades, the FFP design and its influence on the efficiency and durability of FCs has been a subject of a series of review papers that confirmed existence of different combinations of the FFP geometry, material and operating conditions for better performance (Marappan et al., 2021; Yan et al., 2023; Zhang and Tu, 2024; Xiong et al., 2021). Marappan et al. (2021) analysed how different conventional flow field (FF) configurations, such as serpentine, parallel, interdigitated, and pin-type, affect the efficiency, water management, pressure drop, and overall performance of PEMFCs. The review synthesizes findings from numerous experimental and computational studies to present a comprehensive understanding of the impact of the FFdesign on PEMFC operation. The paper also discusses the advantages and limitations of conventional designs. Yan et al. (2023) provided a detailed analysis of various conventional FFP designs and their influence on FC performance metrics such as power output, efficiency and durability. The authors synthesized recent advances in materials and fabrication technologies for FFP and discussed their implications for improving PEMFC efficiency. Zhang and Tu (2024) explored different designs of FFP in PEMFC and addressed challenges like gas distribution, water flooding and high pressure drops, summarized recent advancements in FFP designs and manufacturing techniques aimed at improving gas diffusion, water management and efficiency. The review also discussed the role of computational modelling and experimental validation in design optimization. Xiong et al. (2021) discussed various modelling techniques used for design optimization of FFP, including computational fluid dynamics (CFD). They review different materials used for bipolar plates, such as graphite, metals, and composites, evaluating their performance, cost, and durability. The paper also explored various fabrication methods, including machining, moulding, and additive manufacturing (AM), highlighting advancements and challenges of each one.

This review paper aims to provide an in-depth examination of FFP designs in PEMFCs with a special emphasis on the bio-inspired designs. The bio-inspired designs follow geometry of natural structures like plant leaves, human lungs and arterial systems, which are estimated as an outcome of evolutionary optimization. Therefore, the FCs with bio-inspited designs of FFPs exhibited higher output power, better water management capacity, and more uniform reactant distribution over the PEM. It was confirmed by numerous theoretical, experimental and CFD studies, which are reviewed and analysed here. Through a meticulous analysis of existing literature and a synthesis of key findings, we will delve into the historical evolution of FFPs and cooling systems, elucidate the critical parameters that govern their design, explore the materials employed in their fabrication, and discuss the various manufacturing techniques used. Additionally, we will evaluate the methods to assess FFP performance, including mass transport, pressure drop, and power output.

In our review, we will focus on promising bio-inspired designs and compare them to conventional FFP designs. We will also connect FFP designs and manufacturing techniques with the actual cost of FFPs in the market, highlighting the economic aspects. Moreover, we will emphasize the important role of coolant channels in improving PEMFC performance and reducing overall weight.

By navigating this comprehensive overview of FFP design, readers will gain valuable insights into the fundamental principles and the latest developments in the critical aspects of PEMFCs. Ultimately, this review aims to contribute to the ongoing progress in the field, inspiring researchers and engineers to push the boundaries of FFP design and drive the widespread adoption of PEMFCs as a clean and sustainable energy source.

2 Role of FFP in PEMFC

Water management within a PEMFC is also crucial for its efficiency. The generation of water as a by-product of electrochemical reactions necessitates a delicate balance in water handling. Excessive water accumulation can lead to FC flooding, obstructing gas flow to the MEA and reducing the performance. The design of FFPs addresses this challenge by enabling precise water removal and maintaining proper hydration, thereby optimizing cell performance (Zhang et al., 2015; Cao et al., 2013; Kandlikar, 2008).

2.1 FFP designs

We can categorize the design of FFP into two primary groups: conventional designs along with their modifications, and bio-inspired designs that are derived from natural models, as illustrated in Figure 5.

FIGURE 5

2.1.1 Conventional designs and their modifications

The existing designs of FFP in PEMFC can be broadly categorized into conventional designs, their combinations (synthetic or hybrid design) and novel/modified designs. Conventional designs typically include parallel, serpentine, interdigitated and pin-type (or mesh-type) FFPs. The serpentine design involves channels that snake and forth across the flow field, that increases the path length for reactant gases and, therefore, the hydraulic resistivity of the FFP. The design may be based on a single serpentine channel (Figure 6a) or several parallel channels (Figure 6b). The parallel FFP includes straight channels that run from one end of the plate to the other (Figure 6c). The pin-type/mesh-type design replaces traditional channels with an array of pins or grooves that protrude from the plate by creating a more open FF(Figure 6d). The interdigitated design is composed by the interlaced parallel channels with open ends (Figure 6e) (Sierra et al., 2014; Sauermoser et al., 2020). The single-channel serpentine design is accepted as a ‘golden standard’, and novel FFP designs are usually compared to the efficiency of the serpentine cathode FFP at the same operating conditions. Different designs can be taken at the anode side for more uniform fuel distribution and heat generation, while the serpentine design is mostly used at the cathode side for better water removal. Any combinations of different conventional and non-conventional designs at two electrodes could be used. The most advancing designs and operating conditions, and their specifications are summarized in Table 1.

FIGURE 6

TABLE 1

N	Design		Type of study and operating parameters	Ref
1	Parallel Trapezoid Baffle	Staggered Trapezoid Baffle	CFD* and exp** Active area: 26.95 cm2 (55 mm × 49 mm) Thicknesses of the bipolar plate, GDL, CL, and membrane: 1.5 mm, 0.2 mm, 0.01 mm, and 0.0508 mm, respectively Operating Temperature: 348.15 K	Wang et al. (2020)
2	Sinusoidal channels at the cathode side		CFD and exp Active area: 25 cm2 The flow rates were maintained at 0.2 L/min at the anode and 0.5 L/min at the cathode Operating temperature: 333.15 K	Vijayakrishnan et al. (2020)
3			CFD and exp Active area: 25 cm2 Flow rate: 2.05e−7 kg/s at the anode inlet, and 1.67e−6 kg/s at the cathode Operating pressure: 1 bar Operating temperature: 323 K	Velisala and Srinivasulu (2018)
4			CFD Length L = 30 mm W = 0.25, 0.35,0.5 mm H = 0.15, 0.35, 0.55 mm Velocity: 0.2 m/s	Wan et al. (2020)
5	Parallel Z-shape FFP (top left) Serpentine of Z -2Z -3Z - S -2S –W shapes Novel modified W-shaped FF(bottom right)		Exp Operating Temperature: 40°C–100°C Pressure: 0.4–0.7 bar Voltage: 7–11.4 V Flow rate of hydrogen: 3 L/min Startup of FC: 1–3 s	Dhahad et al. (2019)
6	parallel and parallel-serpentine-parallel flow field		CFD Active area: 510.4 mm2 Inlet mass flow rates anode: 3.07 x 10^7 kg/s cathode: 8.15 x 10^6 kg/s	Hu et al. (2023)
7	carbon bipolar plate at the cathode side		Exp The channel width was limited to 0.6 mm Depth:1 mm Active area: 20 cm2 (10 × 2cm)	Choi et al. (2022)
8	3D stepped flow fields		Exp Length of channel: 50 mm Width of channel: 1 mm Height of channel: 2 mm Width of Rib: 1 mm Height of Rib: 2 mm Inlet mass flow rates Hydrogen: 1.6 x 10−6 kg/s Air: 2.4 x 10−5 kg/s	Lu et al. (2024)
9	3days-printed serpentine FF		Exp Active area: 5 cm2 The flow rate of hydrogen and air 0.2 L/min Thickness of the flow plate: 10mm	Yoo et al. (2022)
10	sinusoidal wave flow channel		CFD Channel length: 90 mm Channel width: 2 mm Channel height: 1 mm Rib width: 1 mm	Zhou et al. (2022)
11	shifted sinusoidal wave flow channels		Exp Active area: 2 cm2 Operating temperature: 343.15 K Depth of channel: 0.6 mm	Mojica et al. (2021)
12	Trap-shape channel		CFD Channel length (Lch): 50 mm Channel width (Wch): 1 mm Channel height (Hch): 1 mm Trap length (L trap): 2, 5, 8, 11, 14 mm Trap width (Wtrap): 0.25 mm Land or shoulder width (Wland): 1 mm Operating temperature: 353K	Ramin et al. (2019)
13	(a) Traditional serpentine design (b) multi-serpentine design (c) hybrid design		Exp Active area: 25 cm2 Channel depth: 2 mm Operating temperature: 333.15 K Stoichiometry for hydrogen is 1.4 oxygen is set to 1.2	Chadha et al. (2021)
14	(a) Novel A (b) Novel B (c) Serpentine channel		CFD and exp Active area: 80 cm2 Channel depth: 1.5 mm Width: 2 mm Length: 2 m	Xu et al. (2024)
15	Discontinuous S-shaped		CFD Active area:6 cm2 The length of channel: 50 mm Width and height of channel:1 mm The inlet and outlet angle:120°	Dong et al. (2021)

Modifications of conventional design of FFP with their dimensions and operating parameters (*CFD means numerical simulations, **exp means experimental study).

As it follows from the variety of designs presented in Table 1, the attempts to improve performance of the FFP in fuel delivery (lower pressure drop), more uniform distribution of the gases, water management (easy and fast water removal from the FC), and higher electric voltage at given flow rate of the fuels and based on (i) modifications of the channel’s shape (rows N1, 4, 5, 12); (ii) variations (N3, 8, 9) or (iii) combinations (N6, 7, 13, 14) of conventional designs; and (iv) waved channels (N2, 10, 11, 15). The obtained rise in efficiency of the FC, advantages and disadvantages of each FFP design are summarized below.

Wang et al. (2020) (N1 in Table 1) combined numerical simulations and experimental tests to evaluate the effect of baffle plate arrangements in PEMFCs. The baffle plates, which optimize reactant distribution and enhance mass transfer, significantly improve FC performance; the study found that incorporating baffle plates increased the peak power density by 15.3%. Advantages include better water management and enhanced reactant distribution, while disadvantages involve potential increased pressure drop for fuel pumping and the need for precise manufacturing.

Vijayakrishnan et al. (2020) (N2 in Table 1) explored the impact of a sinusoidal channels at the cathode side on the PEMFC performance. Both numerical simulations and experimental tests were conducted on 5 × 5 = 25 cm² and 10 × 10 = 100 cm² FC. Results showed that the novel sinusoidal FFimproved water removal and enhanced performance, increasing the power density by 7.7% compared to conventional serpentine FFP. Combining sinusoidal and serpentine flow fields further increased the power density by 14%. Advantages include better water management and higher power density, while disadvantages involve potential complexity in manufacturing.

Velisala and Srinivasulu (2018) (N3 in Table 1) explored the performance of PEMFC with different flow channel configurations. Both numerical simulations and experimental tests were conducted on single (1-S), double (2-S), and triple (3-S) serpentine flow FFPs. The results showed that the 3-S configuration achieved the highest performance, with a 12.5% increase in power density compared to the single serpentine configuration due to improved reactant distribution and water removal. The study highlights advantages such as enhanced mass transport and reduced concentration losses, while disadvantages include the increased complexity and higher pressure drop for fuel pumping.

Wan et al. (2020) (N4 in Table 1) involved numerical simulations to optimize the M-like flow channel design. The M-like channel showed better performance (21.3% higher) in terms of heat and mass transfer compared to conventional designs. The optimized design resulted in reduced entropy generation and enhancing overall efficiency of the FC. Advantages include improved thermal and fluid management, while disadvantages could involve the complexity of manufacturing such channels.

Dhahad et al. (2019) (N5 in Table 1) examined the impact of different FF designs on PEMFC performance experimentally. The research compared eight parallel z-shape and w-shape channels, and found that novel design significantly enhance PEMFC efficiency by more uniform reactant distribution and more efficient water management. The best-performing design increased power density by 18%, highlighting its potential for improved performance. Advantages include better gas distribution and reduced water clogging, while disadvantages involve higher pressure drop needed for fuel pumping due to higher hydraulic resistivity of the z-shape and w-shape channels.

Hu et al. (2023) (N6 in Table 1) employed multi-physics coupling simulations to optimize the FF structure in PEMFC. The study revealed that the optimized structure significantly improves the uniformity of reactant distribution and water management, enhancing overall performance. The novel design reduced entropy generation and increased power density by 10%. Advantages include better thermal and water management, while disadvantages involve the complexity of implementing the optimized designs in practical applications.

Choi et al. (2022) (N7 in Table 1) investigated the effects of non-uniformly arranged 3D-printed metallic structures in the cathode flow channel of PEMFC. The study utilizes a 3D metal printer to create complex geometries, revealing that the non-uniform arrangement significantly enhances the mass transfer and performance. Advantages: the optimized design resulted in a 13% increase in maximum power density compared to uniform structures, with better gas distribution and reduced flooding. The main disadvantage is the complexity of manufacturing the intricate design​.

Lu et al. (2024) (N8 in Table 1) explored the performance of 3D-printed FFP with novel stepped design of the channels width. The study, which includes both numerical simulations and experimental validation, found that the design significantly improves the mass and heat transfer, resulting in a 15% increase in power density compared to conventional designs. Advantages include improved efficiency and better water management, while disadvantages involve the complexity and cost of 3D printing of the complex multi-layer cell​.

Yoo et al. (2022) (N9 in Table 1) explored the development and performance of bendable PEMFC using 3D-printed flexible FFP. The study includes experimental evaluations of the FC in both flat and bent positions. It was found, the PEMFC achieved a peak power density of 87.1 mW cm^-2 when bent, compared to 30.2 mW cm^-2 in the flat position. This enhancement is attributed to the compressive stress on the MEA during bending, which reduces ohmic and charge transfer resistances (advantages). The research highlights the potential of 3D printing in creating cost-effective, high-performance flexible FC with simple structures.

Zhou et al. (2022) (N10 in Table 1) examined the impact of an opposite sinusoidal wave flow channel on the performance of PEMFC. Through numerical simulations, the study explores how variations in the amplitude and period of the sinusoidal wave affect FC performance. The findings indicate that this novel flow channel design significantly enhances mass transfer and water removal capabilities, resulting in improved overall performance. The optimized flow channel design achieved an increase in power density in 16.6%, attributed to better gas distribution and reduced flooding. The main advantages include enhanced efficiency and effective water management, while potential disadvantages involve the complexity of fabricating such intricate designs.

Mojica et al. (2021) (N11 in Table 1) investigated the performance of PEMFC with converging-diverging flow channels. This design aims to enhance convective mass transport and improve overall cell efficiency. The study combines numerical simulations and experimental tests, finding that the converging-diverging channels lead to a 12% increase in power density compared to conventional flow channels. The improved performance is attributed to more effective reactant distribution and reduced concentration polarization. The main advantages include better mass transport and increased efficiency, while disadvantages involve potential complexities in channel manufacturing.

Ramin et al. (2019) (N12 in Table 1) investigated the impact of trap-shaped flow channels on the performance of PEMFCs. Through both numerical simulations and experimental validation, the study demonstrates that the innovative trap-shaped channels significantly improve power density by enhancing reactant distribution and water management. The results showed an increase in power density by 18% compared to conventional flow channels. The advantages of this design include more uniform gas distribution and reduced flooding, while disadvantages may involve increased complexity in the manufacturing process and potential high pressure drop for fuel pumping.

Chadha et al. (2021) (N13 in Table 1) explored the effects of hybrid multi-serpentine FF geometries on the performance of PEMFCs. Through numerical simulations and experimental analysis, the study focuses on improving water redistribution and reducing pressure head losses. The new geometries significantly enhance water management and reduce pressure losses, resulting in a 20% increase in power density compared to traditional designs. The advantages include improved efficiency and better water management, while disadvantages may involve the complexity of implementing these complex geometries in manufacturing processes.

Xu et al. (2024) (N14 in Table 1) investigated the performance of a novel coolant channel design for PEMFCs. The study employs both numerical simulations and experimental tests to analyse the impact of the designs on thermal management and overall cell performance. The findings revealed that the novel designs significantly enhances heat removal, leading to improved temperature uniformity and a 15% increase in power density compared to conventional serpentine design. Advantages include better thermal management and increased efficiency, while disadvantages might involve the complexity and cost of implementing the new coolant channel design.

Dong et al. (2021) (N15 in Table 1) investigated the effect of incorporating discontinuous S-shaped and crescent ribs into the flow channels of PEMFC. The study combines numerical simulations with experimental validation to assess how these novel rib configurations enhance FC performance. The results show that these designs significantly improve energy performance by optimizing reactant distribution and water management, leading to a 17% increase in power density compared to conventional flow channels. The main advantages include enhanced mass transport and reduced water flooding, while the disadvantages involve the complexity and potential cost of manufacturing of the intricate rib structures and potential increases in pressure drop for pumping.

Therefore, modifications of the shape of the channels (trapezoidal, waved, stepped, m-shape, w-shape, S-shape, etc.) and their arrangement on the FFP (z-type, multi-serpentine, hybrid serpentine in combination with parallel, etc.) allow improvement of the FC efficiency in 7.7%–21.3%. The increase in efficiency of the FFP designs N1-15 cannot be accurately compared due to different size and operating parameters of the prototypes and different CFD models used in numerical simulations. In general, modifications of the cross-sectional shape of the channels (trapezoidal N1, stepped variation in the channel width N8, trap-shape width changes N12) increased the efficiency in 15.3, 15% and 18%, accordingly. Since the channels with varied width provide better flow mixing, it could be the main mechanism for improvement of the fuel distribution and heat transfer to the electrodes and, finally, to the cooling system. Waved channels in both in-plane (N2, N10, N15) and orthogonal (N11) planes also produce higher flow mixing that leads to the increase in the efficiency in 2.2, 16.6, 12, and 17%, accordingly. Flows in the waved channels does not experience sudden turn (180°) like in the serpentine flow, and the hydraulic resistance of the channels is reasonably low compared to the single-serpentine design. Therefore, such FFPs need lower pressure drop for pumping of the fuels at any given flow rate. Replacement of regular sudden turn 180° of the channel in the n-serpentine design by smooth circular arches (N3) increased the efficiency in 1.5%. A combination of parallel with single-serpentine (N6) increased the efficiency in 10%. Therefore, replacement of rectangle turns in (Hu et al., 2023) by the arches could be proposed for further improvement of N6 based on the results (Velisala and Srinivasulu, 2018). The highest rise in the efficiency (∼20%) was obtained for the channels with M-type cross section (N4, 21.3%), hybrid multi-serpentine design (N13, 20%), trap-shape channel (N12, 18%) and zig-zag channel (N5, 18%).

It is difficult to say, whether a combination of the elements (waved walls and cross-sectional geometry of channels, their location on the FFP, smoothed turns, combination with convenient designs) will produce a more efficient design, because the FC has a very complex composition, structure, chemical, physical and mechanical processes inside it. Anyway, the comparative analysis confirmed a significant importance of better flow mixing, low hydraulic resistance of the channels and low electric resistance of the components of PEMFCs for improvement of their efficiency in >20%. The disadvantages of almost all novel designs are connected with complex systems of channels which are difficult and costly for manufacturing.

2.1.2 Bio-inspired designs

Biologically inspired design (BID) methodology offers a systematic approach for designing based on natural tree-line flow fields that based on the length and width/diameter scaling in the consequent bifurcations of channels/tubes (Murray’s law) as explained in Equation 4 (Fan et al., 2022; Kizilova, 2004)where and are scaling coefficients, , are the numbers of the orders of bifurcations in the tree-like system.

BID involves precise design steps, such as recognizing and applying biological techniques. Case studies have demonstrated the application of BID in creating innovative designs, such as fish-inspired and bird-inspired robots, and mastication robots. The principal gaining traction is Murray’s law (Pentelovitch and Nagel, 2022; Luo et al., 2020; Wang and Deng, 2022; Molina et al., 2020).

Recently, the concept of mimicking nature to enhance the design of FFP in PEMFC has garnered considerable attention. These innovative designs are inspired by the efficient transport mechanisms observed in natural systems, aiming to replicate their high efficacy in FCs. For instance, the branched and stepped FF designs draw their inspiration from the intricate network of veins in leaves or the vascular systems in animals as shown in Figure 7 (Fan et al., 2022; Kizilova, 2004). Some prototypes of biological design for FFP in PEMFC with their dimensions and operating conditions are presented in Table 2.

FIGURE 7

Ghadhban et al. (2021), (c)Badduri et al. (2019), (d)Li et al. (2022a).

TABLE 2

N	Design	Dimensions and operating parameters	Ref
1	In-plane lung-type	Active area: 49 cm2 Bipolar plate thickness:10 mm Channel width:1 mm Channel depth:1 mm Operating temperature 333.15–353.15 K Pressure:1–5 bar	Badduri et al. (2019) Exp
2	Ginkgo leaf Net leaf	Active area: 25 cm2 Channel width: 0.8 mm Channel depth: 0.8 mm Hydrogen flow rate: 350 cm3/min Air flow rate: 1900 cm3/min Operating temperature: 353 K Inlet relative humidity: 100% Absolute pressure: 101 kPa	Kang et al. (2019) Exp
3	Wave-cuttlefish FFP	Active area: 2 cm2 Channel length: 20 mm Channel width: 1 mm Channel height:1 mm Rib width: 1 mm Operating temperature: 343.15 K	Cai et al. (2020) CFD and Exp
4	Fractal cathode FFP	Active area: 25 cm2 Depth of flow channel: 1 mm Thickness of the FFP 8 mm (6 plates)	Bethapudi et al. (2021) Exp
5		Active area: 50 cm2 Channel width: 0.8 mm Channel depth: 1.1 mm Operating temperature 55°C–75°C	Suárez et al. (2022) Exp
6	Bio-inspired sinusoidal	Active area: 4 cm2 Channel depth: 1 mm Channel width:1 mm Operating temperature: 298.15K	Ke et al. (2023) CFD and Exp
7	T-type fractal	Active area: 25 cm2 Inlet channel width: 5 mm Outlet channel width: 1 mm Channel depth: 1 mm Width scale: = 0.917–0.925 Number of the outlets: 64 Operating temperature: 353.15 K	Sauermoser et al. (2021) Exp
8	Leaf-type branching	Active area: 25 cm2 FFP dimensions: 51 × 51 mm FFP thickness: 2.9 mm Channel width: 1 mm Channel height:1 mm Angle to the inlet channel: 15, 18, 22.5, 30, 40°	Chen et al. (2023) CFD and Exp
9	Lung-type fractal cathode FFP	Active area: 6.25 cm2 FFP thickness: 9.6 mm Number of outlets: 256 Dimensions of the outlet channels: 400 × 800 μm with 1.18 mm spacing between them	Bethapudi et al. (2019) Exp
10	leaf vein flow channel tree shape flow	Active area: 9.84 cm2 FFP thickness: 3 mm Channel depth: 0.4 mm	Ghadhban et al. (2021) Exp
11	Snowflake bionic flow channel	Active area: 25 cm2 Channel depth: 1.5 mm Inlet diameter: 3.5 mm	Li et al. (2022a) CFD and Exp
12	Spiral channel	Active area: 2500 mm2 Inlet channel width: 1 mm Outlet channel width: 0.5 mm	Jang et al. (2012) CFD and Exp
13	nautilus bionic channel	Channel width: 0.6 mm Outlet channel height: 1.2 cm Circular rib width: 0.6 mm Channel height: 1 mm	Li et al. (2023a) CFD
14	Artery-inspired flow field	Active area: 49 cm2 Channel dimensions: 1 × 1 mm Operating temperature: 20, 35, 50, 65, 80°C	Huang et al. (2020) CFD and Exp
15	Spider bionic flow channel	Active area: 10.24 cm2 Channel depth:1 mm Inlet channel area:16 mm2	Yao et al. (2022) CFD
16	Fishbone-shaped design	Active area: 25 cm2 Channel length:1 mm Channel width:1 mm	Wang et al. (2021) CFD

Examples of bio-inspired designs of FFP in PEMFC.

A range of studies has compared the performance and efficiency of bio-inspired and conventional FFP designs in PEMFCs. Badduri et al. (Badduri et al., 2019) (N1 in Table 2) investigated the performance of novel lung channel design FFP experimentally. The lung channel design aims to enhance reactant distribution and water management within the FC. Results showed a significant improvement in performance, with a 19% increase in power density compared to traditional serpentine FFP (advantages). Kang et al. (Kang et al., 2019) (N2 in Table 2) experimentally investigated the system of channels inspired by ginkgo leaf and the rectangular network of channels of the same size. The maximum power density for the ginkgo-like FFP was 6.7% lower than that for the serpentine flow field, and 40% higher than that for the parallel FF under standard operating conditions. Cai et al. (Cai et al., 2020) (N3 in Table 2) analysed wave-like channel design inspired by cuttlefish and optimized using a genetic algorithm. The study combined numerical simulations with experimental validations to assess the performance improvements of this novel design. Results indicated that the bionic wave-like channel significantly enhances cell performance by improving reactant distribution and water management, leading to a 22% increase in power density compared to serpentine channel designs. Advantages include better mass transport and reduced flooding.

Bethapudi et al. (2021) (N4 in Table 2) explored the performance of PEMFC using a fractal FFP with T-junction (180° angle in the bifurcations) for cathode side. The consequent generations of the fractal channels of different generations (j = 1,2,3,4,5) were carved in different plates that increased the thickness of the FFP. The study combined numerical simulations and experimental methods to evaluate the electro-thermal characteristics of this novel design. Results indicated that the fractal FFP significantly improved thermal management and increased the uniformity of current density distribution (advantages), leading to a 20% increase in power density compared to serpentine flow field. However, the complexity and potential cost of manufacturing such intricate designs are noted as (disadvantages). Suárez et al. (Suárez et al., 2022) (N5 in Table 2) explored the impact of fractal inlet and outlet (2 generations) to the active area of the PEMFC on its performance. The study employed both numerical simulations and experimental testing to evaluate several bio-inspired flow channel structures, including designs based on leaves, lungs, and sponges. The most promising design was selected, manufactured, and tested. Results showed that the proposed FFP, particularly the design incorporating hydrophobic graphene porous sponge inserts, significantly improved water management and performance even at high relative humidity, achieving a 6% increase in peak power density compared to the conventional parallel-serpentine designs.

Ke et al. (2023) (N6 in Table 2) investigated the effects of bio-inspired sinusoidal channels on the performance of PEMFC. Through both numerical simulations and experimental tests, the study evaluated how this design can increase the power density produced by PEMFC. The results showed that the sinusoidal flow channels significantly enhance oxygen transport and reactant distribution, leading to a 15% increase in power density compared to serpentine flow channel. The advantages include improved mass transport and reduced oxygen starvation, while disadvantages involve the complexity and potential cost of manufacturing. Sauermoser et al. (Sauermoser et al., 2021) (N7 in Table 2) investigated the impact of varying channel widths in tree-like T-type fractal FF on PEMFC performance. Since the outlets of the T-type fractal with six to seven generations uniformly distributed over the square or rectangle area of MEA, the reactants are delivered to the PEM more uniformly. The experimental study with relative humidity of hydrogen RH = 50%, 60%, 70% revealed, a decrease in the width-scaling parameters α led to improved PEMFC performance. The best performance were detected at RH = 70%, and the corresponding performance was 11% lower compared to the serpentine FFP at the same flow rates and RH. Among the disadvantages is water accumulation in the channels, which is the main reason for reducing power density.

Chen et al. (2023) (N8 in Table 2) investigated the use of a tree-like fractal channels inspired by palmate venation of some leaves for cooling FF in PEMFC to improve temperature distribution and cooling capacity. Using both numerical simulations and experimental analysis, the study found that the fractal cooling FF achieved better coolant distribution and temperature uniformity compared to parallel and serpentine flow fields. The results show a reduction in maximum temperature from 340.7 K to 337.8 K and improved temperature uniformity, making the fractal design effective in solving local overheating issues (advantages).

Bethapudi et al. (2019) (N9 in Table 2) explored the use of a lung-inspired fractal flow-field design in PEMFC. This design aims to provide homogeneous and uniform distribution of reactants by mimicking the airflow mechanism in human lungs. The study involved both experimental and numerical analyses, and the fractal flow-fields are fabricated using low-cost, lightweight printed circuit boards (PCBs). The performance of these lung-inspired flow-fields was found higher than the single-serpentine flow-fields, especially under conditions of low RH (advantages). The 3D fractal tree is difficult for manufacture but it can be produced by 3D-printing technology. Ghadhban et al. (Ghadhban et al., 2021) (N10 in Table 2) examines the impact of FF designs inspired by pinnate venation of some leaves and by tree branches. The study finds that these designs, which mimic natural patterns, significantly enhance water management and reactant distribution, leading to a 15% increase in power density compared to conventional serpentine flow fields. The proposed bio-inspired designs improve water management, reducing flooding and maintaining more stable performance at higher current densities. They also achieve better uniformity in reactant distribution and reduce pressure drops by 10% (advantages).

Li Y. et al. (2022) (N11 in Table 2) examines the use of a snowflake-shaped bionic FF to enhance PEMFC performance. By integrating the advantages of leaf vein and lung-shaped channels, this design aims to improve gas supply uniformity and reduce pressure drop. Utilizing a 3D multi-physics FC model, the study shows that the snowflake bionic design significantly reduces pumping work and enhances flow uniformity (advantages). For the peak power density, the snowflake FF design had a 27%, 66% and 45.5% higher values compared to the leaf vein, lung-type and double-serpentine FFS, accordingly. After optimization, the non-uniformity of the fuel flow rates between the outlets of the FF was reduced by 29.98% compared to the non-optimized design.

Jang et al. (2012) (N12 in Table 2) explored the performance of PEMFC with spiral flow channels. Through a combination of numerical simulations and experimental tests, the study investigated how these spiral channels affected the FC’s efficiency and performance. The results show that the spiral flow channels significantly enhance reactant distribution and water management within the FC. Specifically, the spiral channels increased the average current density by 11.9% compared to conventional serpentine channels. Additionally, the spiral design contributed to a reduction in pressure drop (advantages). Li N. et al. (2023) (N13 in Table 2) investigated the use of a nautilus-inspired FF design to enhance PEMFC performance. Through numerical simulations and experimental analyses, the study showed that the nautilus bionic FF significantly improves reactant distribution and reduces pressure drops compared to conventional serpentine FF. The best increase in power density in comparison to the serpentine FF at ∼8% was achieved. Huang et al. (2020) (N14 in Table 2) explored the implementation of a bionic FF inspired by the structure of the superior mesenteric artery in human. Through numerical simulations and experimental tests, the study demonstrated that this design improves the FC performance by enhancing water removal and reactant distribution over the PEM. The mesenteric artery-based FF increased the droplet removal rate by 36.3% and improved the power density by 12.5% compared to conventional serpentine flow fields. This design effectively addresses issues of pressure drop (advantages).

Yao et al. (2022) (N15 in Table 2) explored the performance improvements of PEMFC using a spider web-inspired FF design. Through both numerical simulations and experimental studies, the research demonstrated that the spider bionic FF significantly enhanced reactant distribution and water management. Compared to serpentine flow channels, the spider bionic design improved power density by 9% and reduced pressure drop by 13%. These enhancements are attributed to more uniform distribution of reactants, as well as better removal of water from the channels (advantages). Wang et al. (2021) (N16 in Table 2) examined the effectiveness of a nature-inspired fishbone-shaped cathode FF in PEMFC. Using numerical simulations and experimental analyses, the study found that this bio-inspired design significantly improved mass transport and water removal compared to parallel flow field. Specifically, the fishbone design enhanced power density by 18% and reduced pressure drop by 22% (advantages).

Therefore, bionic nature-inspired designs for reactant flows in FCs are promising due to higher increase in the FC efficiency (>20% and 40% compared to the serpentine and parallel designs, accordingly), low pressure drop for fuel pumping and better water management. The efficiency of such designs is based on the evolutionary optimized systems of arteries in human and animals, and plant roots and leaves for transportation the biological fluids at low energy expenses and low uniform pressure drop that corresponds to the Murray’s law (4).

As it follows from the detailed review of the main features of the bionic FFPs, they provides higher increase in the power density and overall efficiency compared to the improved convenient designs and their combinations (hybrid FFPs). The ∼20% rise in power density was achieved by a combination of bifurcated and interdigitated geometry based on the Murray’s law (4) (N1 in Table 2); the wave channel followed the cutterfish pattern (N3 in Table 2); the T-type fractal FFP with five generations of bifurcations drilled in five parallel plates (N4 in Table 2); the snowflake-type FFP followed the Murray’s law (4) (N11 in Table 2); and the fishbone-shaped FFP (N16 in Table 2). The highest increase in the performance was shown in the snowflake-type FFPs inspired by human lung geometry, plant leaves geometry, and their combinations (up to 45.4% rise in the power density). Note, many of the designed geometries, have numerous connections between the channels (loops) that allows the water accumulated in the channels to be removed along different ways, because the networks with loops allow different flow pathways that is beneficial for flooding prevention. The designs N2, 8, 11, 13, 14, 16 in Table 2 are efficient for water removal and low pressure drop for fuel pumping due to presence of numerous connections between the channels (loops). This observation could be very helpful for future trends in development of FFPs for PEMFCs.

Based on the examples provided in Tables 1, 2, a wide range of conventional and bio-inspired FFP designs have been explored in the literature. While conventional designs such as serpentine, parallel, or baffle-based channels prioritize simplicity and manufacturability, bio-inspired configurations like lung-type or leaf-patterned FF aim to mimic the optimized flow networks, which are abound in nature. To clarify the strengths and trade-offs of each category, Table 3 presents a comparative summary of their main advantages and disadvantages.

2.2 Coolant channels in FFP

The design of coolant channels in FFPs involves a balance between maximizing heat removal and minimizing the disruption to fuel and oxidant distribution across the FC. These channels are not merely conduits for coolant flow; they are a critical part of the FCs architecture including their size, shape and flow path, influencing everything from the FC’s thermal and hydraulic performance to its electrical efficiency and material durability. The coolant fluid is typically water, glycol mixture or a base fluid with nanoparticles; the last one gets more attention recently from researcher to develop (Li C. et al., 2022; Afshari et al., 2022; Song et al., 2022; Hashmi, 2010). Different techniques for the cooling channels are presented in Figure 8. The most efficient examples of the cooling system are summarized in Table 4.

FIGURE 8

Hashmi, 2010)).

TABLE 4

N	Geometry	Highlight	Ref
1		Coolant: liquid cooling Location: Anode and cathode Geometry: parallel channels with square cross-section Dimension:0.61 × 0.42 mm	Celik et al. (2022)
2		Coolant: liquid (water) Location: Anode and cathode Type of channels: 12 parallel straight channels	Pei et al. (2019)
3		Coolant: liquid Geometry: serpentine co-flow, cross-flow and counter flow Number of channels: 15	Lin et al. (2019)
4		Coolant: water-steam cooling (phase change material)	Neofytidis et al. (2023)
5		Coolant: water Location: Anode Geometry: parallel and serpentine FFs	Acar (2023)
6		Coolant: evaporative cooling Geometry: parallel micro channels	Li et al. (2023b)
7		Coolant: Air and metal foam Location: cathode Geometry: parallel Active area: 100 cm2	Hmad and Dukhan (2021)
8		Coolant: Air/liquid Location: cathode Geometry:Zigzag channel	Liao et al. (2021)
9		Coolant: liquid (glycol) Geometry: straight and wavy channels	Huo et al. (2025)

Advanced design for the cooling channels in bipolar plates of PEMFC.

The materials, geometry and operating conditions of the cooling systems for PEMFC stacks given in Table 4 are briefly summarized below. Their benefits and limitations are discussed. Celik et al. (Celik et al., 2022) (N1 in Table 4) investigated the use of titanium bipolar plates created through additive manufacturing for use in PEMFC, particularly in electric vehicles. The study employs active cooling methods using these advanced titanium plates. The main advantages include improved durability, corrosion resistance, and mechanical strength of the titanium plates, which enhance the overall performance and longevity of the PEMFCs. The results show that the titanium bipolar plates achieved a peak power density of 639 mW cm^-2.

Pei et al. (2019) (N2 in Table 4) investigated the use of separated coolant flow channels for the anode and cathode of PEMFCs. This cooling approach allows for independent temperature control on both sides, improving overall thermal management. The main advantages include enhanced temperature uniformity and reduced thermal stresses, leading to more stable FC operation. The study found that this design significantly increased power density by 13% compared to conventional single-loop cooling systems, and improved water management by reducing the risk of flooding.

Lin et al. (2019) (N3 in Table 4) optimized both the configuration and operating parameters of liquid-cooled PEMFC stack. The study focused on liquid cooling as the primary cooling method, which enhanced thermal management and operational stability. The main advantages of this approach included improved temperature control and temperature uniformity over the MEA, which are critical for the efficient operation of PEMFCs. The results show that the optimized configurations and parameters led to a significant increase in power density by 9.5%.

Neofytidis et al. (2023) (N4 in Table 4) explored the implementation of a two-phase liquid cooling system for high-temperature PEMFC. This cooling method leverages phase change (water-steam) to manage thermal loads effectively. The advantages include enhanced thermal management and reduced complexity due to the pumpless design. The study found that the innovative cooling system improved power density to 0.18 W/cm² at 180°C.

Acar (2023) (N5 in Table 4) investigated the thermal performance of PEMFC using serpentine and straight coolant flow channels. The study utilize. numerical modelling to examine the effects of different coolant flow directions on heat removal efficiency. The results showed that optimizing the coolant flow direction can significantly enhance thermal performance, with the straight flow channels improving temperature uniformity by 55.45% compared to the serpentine FF.

Li Y. et al. (2023) (N6 in Table 4) investigated the thermal management of PEMFC using various micro-channel configurations with flow boiling. The study focused on experimental analysis of three different micro-channel designs to evaluate their effectiveness in cooling. The advantages of using flow boiling in micro-channels include higher heat transfer coefficients and better temperature uniformity compared to traditional single-phase cooling methods. The results demonstrated that the optimal micro-channel configuration significantly reduced the maximum temperature by up to 15%.

Hmad and Dukhan (2021) (N7 in Table 4) investigated the use of air cooling combined with open-cell metal foam in PEMFC stacks. The study involved both numerical simulations and experimental testing to assess the efficacy of this cooling method. The metal foam, with a pore size of 0.65 mm and 60% porosity after compression, enhanced heat transfer and temperature uniformity. The results showed that employing metal foam for air cooling significantly improved thermal management compared to traditional liquid cooling. Specifically, the metal foam increased the efficiency of heat removal, maintaining lower and more uniform temperatures across the FC stack.

Liao et al. (2021) (N8 in Table 4) investigated zigzag-shaped channels for both reactant and cooling fluid flow management. The study highlighted the significant impact of these channels on enhancing the uniformity of reactant distribution, achieving a more uniform temperature distribution, and improving overall performance despite an increase in pressure drop. Key findings showed that zigzag channels enhance mass transfer, leading to a 12% improvement in current density distribution and a 15% reduction in temperature variance across the FC. Additionally, the zigzag design resulted in a 20% increase in pressure drop.

Huo et al. (2025) (N9 in Table 4) proposed a novel cooling strategy for large-scale PEMFCs using two models. A single heat transfer model evaluated four coolant channel types. Straightandwavy and different wavy channels showed better temperature uniformity, but higher pressure drops compared to the straight channels. The straightandstraight and straightandwavy channels had lower parasitic power but less uniform flow. A combination of the 3D and 1D flow models with a new Linearly Varying Temperature Convection (LVTC) method replaced complex channel geometry. LVTC achieved high accuracy with only 1.126% voltage deviation, offering an efficient tool for PEMFC thermal simulation and cooling design.

Therefore, modifications in the shape (waved, zigzag, etc.) and location of the cooling channels can significantly increase the overall efficiency (by 10%–13%) and enhance the uniformity of temperature distribution (by 15%–55%), which is essential for FC technology. A successful combination of proper modifications in both FFs and cooling channels to achieve a synergetic effect remains a key challenge for future development. Moreover, bridging the gap between CFD-based predictions and experimental validations remains a major obstacle, especially in large-area FC systems where multi-physics interactions are complex. In this context, Huo et al. (Huo et al., 2024) demonstrated that digitally assisted structural design could provide a reliable link between simulation and realistic performance, enabling accurate optimization of flow and cooling architectures in large-scale PEMFCs.

3 Materials and manufacturing for FFPs in PEMFCs

There are several alternative ways in which FFPs can be made for PEMFC. All of them can be produced by materials selection, followed by shaping or forming the plate. Afterwards, machining or etching is done to create the gas flow channels, and finally the surface is treated to achieve high hydrophobicity and longevity of the material. Among these characteristics, include easy electrical conductivity, lightweight, and corrosion resistance, which are proper to graphite and many types of polymers. They include methods of injection molding, hot pressing, and stamping used to form the plates in PEMFC (Wilberforce et al., 2017; Cooper, 2004; Ijaodola et al., 2018). Among other methods related to FFP manufacture, are additive production, 3D printing, CNC milling, laser cutting and electroforming.

A classification of materials for FFPs is presented in Figure 9. The developmental target for PEMFC technology and FFPs according to the U.S department of energy, are presented in Table 5 (Tang et al., 2021). Based on the given literature review and Tables 1–4, the overview of materials and manufacturing technologies is given in Table 6.

FIGURE 9

The manufacturing cost of FFP is one of the main criteria in order to select an appropriate method for fabrication. Table 7 gives an overview of the cost incurred for different types of FFP fabrication. The Table shown, the costs has been decreased significantly during the past decade. This is mostly credited to the continued improvement in 3D printing technology, together with the advances in other means of production. The use and development of these methods promise good opportunities for cost reduction, as well as for additional flexibility and increased accuracy in the manufacture of the FFP conditions, which probably have to be considered in their future design.

The declining cost trend of FFPs shown in Table 7 aligns with DOE reports, which indicate a significant reduction in bipolar plate fabrication costs from over $800/kW in the early 2000s to approximately $20/kW in 2016 for high-volume automotive production (U.S. Department of Energy, 2016a). a trend largely attributable to increased competitiveness among manufacturers. This competitive landscape has spurred innovations in manufacturing processes and material utilisation, driving down production costs. Additionally, the entrance of new market players and advancements in technology have further intensified competition.

4 Conclusion and recommendations

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