Abstract
Environmental pollution and energy shortage make the development of clean energy more and more urgent. As a kind of clean renewable energy, hydrogen has attracted more attention recently. WO3-based materials have emerged as one of the most promising candidates for electrocatalytic hydrogen evolution reaction (HER) due to their attractive electrocatalytic activity, low cost, as well as electrochemical durability. In this minireview, we systematically provide an overview of WO3-based materials applied for HER, including pure WO3, doped WO3, and WO3-based composite materials. Furthermore, the strategies to enhance their electrocatalytic performance are summarized and discussed, such as morphological engineering, doping, as well as compositing with other materials. Finally, the limitation and challenges of WO3-based materials for HER and their prospects for future research are proposed. We believe that this minireview will be favorable for scientists to seek more promising HER electrocatalysts.
Introduction
Nowadays, the discovery and use of fossil fuels (such as coal and petroleum) have made great contributions to the development of human society (Wang Y. et al., 2018; ; ; ; Yu et al., 2020). However, the fast development of human society brought excessive emission of carbon dioxides and overuse of non-renewable resources, resulting in many serious problems, such as global warming, climate change, sharp decline in energy reserves, and so on (; Zhao et al., 2019; Wang W. et al., 2020; Zou et al., 2020). Recently, a series of renewable energy resources such as wind energy, solar energy, tidal energy, and hydropower have been intensively studied and emerged as alternatives for fossil fuels (; Liu G. et al., 2018). Meanwhile, electrochemical energy store (; ; Wang et al., 2019e; Wang R. et al., 2020; ; Yuan et al., 2019; ; ; ), electrocatalysis (; ; Wang et al., 2019c, Wang et al., 2019d; Xiao et al., 2019), and other new energy technologies have also developed rapidly in recent years (, ; Zhang et al., 2014, 2018; ; ; Zheng et al., 2020). It is worth noting that hydrogen fuel is of great concern because of its high energy density and abundant natural resources. Moreover, the product of hydrogen combustion is water, which is pollution-free and can effectively reduce the emission of greenhouse gases and toxic gases (Yu et al., 2019).
At present, the production of hydrogen by electrochemical water splitting has caught extensive attention because of its simple and flexible operation (Zou and Zhang, 2015). However, hydrogen production is hindered by the high overpotential of the hydrogen evolution reaction (HER) and the low hydrogen production rate (). Therefore, in order to overcome these defects and promote the production of H2, it is urgent to introduce efficient electrocatalysts. Platinum is acknowledgedly regarded as one of the best electrocatalysts for HER (); nevertheless, further application is limited by its high price. Therefore, it is necessary to explore proper non-noble metals for electrocatalytic hydrogen evolution.
As a transition metal oxide, tungsten oxide (WO3) is expected to be a hopeful candidate to substitute Pt as an electrocatalyst for efficient HER due to its outstanding redox capability, low cost, and high stability (; Wang et al., 2019b). Hence, more and more attention has been paid to investigating WO3-based materials for electrocatalytic HER. For example, reported an article about crumpled graphene/tungsten disulfide/tungsten trioxide with high electrocatalytic HER performance. And recently, reported unique highly dispersed Pt atom clusters on WO3@CFC (carbon fiber cloth) as superior electrocatalysts for HER. Furthermore, gave a comprehensive review on recent progress in WO3-based materials as photoanodes for water oxidation. However, to the best of our knowledge, a critical review that exclusively puts a spotlight on WO3-based materials for electrocatalytic HER has not been reported.
In this minireview, we will give a comprehensive description of WO3-based materials, mainly including stoichiometric WO3, non-stoichiometric WO3–x, doped WO3, and WO3-based composite materials with their application in the field of electrocatalytic HER in recent years. Their micro/nanostructures and electrocatalytic performances for HER are systematically summarized, as shown in Supplementary Table S1. Furthermore, we also present some rational proposals to facilitate breakthroughs in the future. We hope that this minireview could draw more attention to WO3-based electrocatalysts and boost their practical applications.
Nanostructured Tungsten Oxide
Stoichiometric WO3
In recent years, the electrocatalytic performances of WO3 have been greatly enhanced by utilizing nano/micrometer-sized WO3, mainly due to their high surface area to volume ratio. The nanostructured stoichiometric WO3 with different morphologies as electrocatalysts for HER includes nanorods (), nanowires (NWs) (), nanoplates (; ), nanoparticles (), and so on.
For example, developed a facile hydrothermal method to prepare monoclinic WO3 (m-WO3) nanoplates and nanorods (Supplementary Figures S1A,B). The cyclic voltammetry results show the decent stability of m-WO3 nanoplates and nanorods for HER (Supplementary Figures S1C,D). When they are tested at −0.2 V in 1 M H2SO4, m-WO3 nanoplates and nanorods shows cathodic current densities of 17.58 and 23.86 mA cm–2, respectively (Supplementary Figure S1E), and the Tafel slopes of m-WO3 nanoplates (122 mV dec–1) or nanorods (113 mV dec–1) are lower than those of commercial bulk m-WO3 (135 mV dec–1), indicating superior performances for HER (Supplementary Figure S1F). employed a novel microwave-assisted hydrothermal (MH) method to fabricate 1D hexagonal WO3 NWs (hex-WO3). The as-synthesized hex-WO3 samples display different morphology and sizes when the MH time was adjusted from 3 to 12 h (Supplementary Figures S2A–D). The specific activity for HER of hex-WO3 NWs fabricated by MH at −0.1 V is far higher than that of hex-WO3 NWs fabricated by conventional hydrothermal method (CH) and commercial WO3 (Supplementary Figure S2E). Furthermore, the Tafel slope and the exchange current density of hex-WO3 NWs by MH are 116 mV dec–1 and 6.61 mA cm–2, respectively, elucidating better electrocatalytic kinetics of hex-WO3 than those of commercial WO3 (157 mV dec–1 and 0.27 mA cm–2) (Supplementary Figure S2F). The performance enhancement of hex-WO3 NW samples can be attributed to their high aspect ratio and crystallinity.
Non-stoichiometric WOx<3
The performances of tungsten oxide can also be adjusted and controlled by defects in its architecture (; Zheng et al., 2017). Several oxygen-deficient WOx<3 nanomaterials have been reported to promote the electrocatalytic HER efficiencies, such as mesoporous WO2.83 (), WO3–x/Ni foam (NF) (Yi et al., 2018), and monoclinic WO3–x (). For instance, Zheng et al. (2017) synthesized two-dimensional WO3 nanosheets with rich O vacancies via a liquid exfoliation method. The structure of the O vacancies model was built based on WO3 (010) (√2 × √2) R45° slab with the surface of all terminal oxygen atoms as well as one bridging oxygen atom removed (Figure 1A). At 10 mA cm–2, the overpotential of as-synthesized sample is 38 mV and the Tafel slope is also 38 mV dec–1, which is close to the optimal performances of benchmarking electrochemical catalyst Pt/C (Figure 1B). Unique O vacancies were verified by density-functional-theory (DFT) calculation on WO3 to bring in gap states around the Fermi level, which obviously increased hydrogen absorption and reduced H2 adsorption free energy (ΔGH*) (Figure 1C).
FIGURE 1
Hetero-atom Doped WO3
Besides the method of introducing O vacancies in WO3, hetero-atom doping with a metallic element is also an efficient way to promote electron transfer and shorten proton diffusion paths.
In 2014, Xie et al. (2014) reported nanostructured Ta-doped WO3 as an efficient electrocatalyst for HER. The as-prepared Ta-doped WO3 NWs show excellent performance. Later, metallic element doping in WO3 for electrocatalytic HER was further developed, and the mechanism was demonstrated by
WO3-Based Binary Composites
To further enhance electrocatalytic properties for HER, WO3 has been composited with other materials, such as carbon (Wondimu et al., 2018a, b), metals (
WO3/Carbon Composites
Carbon materials are often utilized as conductive materials due to their superior electronic conductivity and outstanding chemical durability (Wu et al., 2019). Hence, compositing WO3 with carbon materials is an efficient way to improve the HER performances (Wondimu et al., 2018a, b;
Not only could the rGO assist the WO3-based materials to be more excellent and efficient, but also other carbon materials could increase the conductivity and further enhance the electrocatalytic properties for HER, such as WO3/C (Zheng and Mathe, 2011), WO3/Carbon nanotube (CNT) (
WO3/Metal-Based Material Composites
Besides carbon materials, construction of WO3 with metal and metal-based materials is regarded as another effective way to enhance the charge transfer and promote the synergistic effect between them (Wang et al., 2019a, b). Up to now, many metal-based materials have been composited with WO3, such as Pt (
FIGURE 2

(A) Scheme diagram for the synthetic process of Pt/def-WO3@CFC. (B) High-resolution transmission electron microscope (HRTEM) of WO3 NPs. (C) Spherical aberration-corrected image of Pt/def-WO3@CFC at atomic scale. (D) Linear sweep voltammetry (LSV) curves in 0.5 M H2SO4 at a scan rate of 1 mV/s and the schematic model for Pt/WO3 nanostructure with O vacancies. Reprinted with permission from
Others
Besides the above mentioned, there are still some WO3-based composite electrocatalysts with enhanced HER performance. The electrocatalyst SiO2/WO3–x nanofacets calcined in situ at 500°C for 5 h (denote as 500-5) by
WO3-Based Ternary Composites
Recently, WO3-based ternary composite electrocatalysts for HER receive more and more attention due to the great synergy effect between the components (
Conclusion and Outlooks
In summary, we briefly review the recent developments of WO3-based materials for electrocatalytic HER. The essential synthetic methods and processes, various nanostructures, and robust performances are generally discussed. From these studies, it is clear that the strategies mentioned above are useful and meaningful for optimizing the electrocatalytic performance of WO3. However, we should recognize that the practical application of WO3-based electrocatalysts for HER is still in early stage and is facing many challenges. First, the majority of works are focusing on the nanostructure morphology and electrocatalytic performances, but the understanding of mechanism is not seriously taken. Second, the latest modern characterization techniques, such as in situ X-ray technique, in situ electron microscopy, and in situ scanning probe technology, should be well used to explore the working mechanisms. Third, DFT calculation is also an efficient way for us to gain insight into the nanostructure–composition–performance relationships, which may be important in the development of catalysts in the future. In addition, among these recent advances, the electrocatalysts introduced O vacancies that almost exhibit outstanding performances close to those of the benchmarking Pt/C. Decent electrical conductivity, appropriate Gibbs free energy ΔGH*, and large active surface areas will possibly render the introduction of O vacancies as a promising strategy and the orientation for better HER process. Last, the electrocatalytic stability should also be seriously considered. We hope this minireview will be helpful and will inspire more innovative ideas for WO3-based or even transition metal oxide materials as electrocatalysts for HER.
Statements
Author contributions
YL, WZ, and SW conceived the idea. YXL and XZ wrote the draft. All authors contributed to the writing, discussion, and revision of the final version of the manuscript.
Funding
This work was supported by Nature Science Foundation of Guangdong Province (No. 2018A030313779). This work was also supported by the Program for Changjiang Scholars and Innovative Research Team in University (IRT_16R21), the Chinese 02 Special Fund (2017ZX02408003), the Scientific and Technological Project of Henan Province (182102210297), Open Fund of National Joint Engineering Research Center for abrasion control and molding of metal materials (HKDNM201807), Scientific Research Starting Foundation for Ph.D. of Henan University of Science and Technology (13480065), Science Foundation for Youths of Henan University of Science and Technology (2013QN006), and the Student Research Training Plan of Henan University of Science and Technology (2019031).
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Supplementary material
The Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fmats.2020.00105/full#supplementary-material
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Summary
Keywords
tungsten oxide, doping, composites, electrocatalyst, hydrogen evolution reaction
Citation
Li Y, Zhai X, Liu Y, Wei H, Ma J, Chen M, Liu X, Zhang W, Wang G, Ren F and Wei S (2020) WO3-Based Materials as Electrocatalysts for Hydrogen Evolution Reaction. Front. Mater. 7:105. doi: 10.3389/fmats.2020.00105
Received
10 March 2020
Accepted
06 April 2020
Published
15 May 2020
Volume
7 - 2020
Edited by
Liang Huang, Huazhong University of Science and Technology, China
Reviewed by
Qiaobao Zhang, Xiamen University, China; Xunhui Xiong, South China University of Technology, China
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Copyright
© 2020 Li, Zhai, Liu, Wei, Ma, Chen, Liu, Zhang, Wang, Ren and Wei.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Yong Liu, liuyong209@haust.edu.cnWanhong Zhang, zhangwh@haust.edu.cnShizhong Wei, wsz@haust.edu.cn
†These authors have contributed equally to this work
This article was submitted to Energy Materials, a section of the journal Frontiers in Materials
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