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        <title>Frontiers in Materials | Energy Materials section | New and Recent Articles</title>
        <link>https://www.frontiersin.org/journals/materials/sections/energy-materials</link>
        <description>RSS Feed for Energy Materials section in the Frontiers in Materials journal | New and Recent Articles</description>
        <language>en-us</language>
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        <pubDate>2026-05-12T22:40:20.478+00:00</pubDate>
        <ttl>60</ttl>
        <item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2026.1796209</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2026.1796209</link>
        <title><![CDATA[Fungal-derived functional carbons for secondary batteries: from biomass architectures to electrochemical performance]]></title>
        <pubdate>2026-04-14T00:00:00Z</pubdate>
        <category>Mini Review</category>
        <author>Jongyoung Choi</author><author>Yurie Jang</author><author>Weon Ho Shin</author><author>Jong Ho Won</author>
        <description><![CDATA[The growing demand for sustainable energy storage has intensified research into biomass-derived carbon materials. Fungal biomaterials provide a versatile carbon source owing to their hierarchical architectures and chitin-rich compositions. This review evaluates fungal sources based on their structural dimensionality, specifically 1D mycelia, 3D sporocarps, and 0D spores. The influence of these specific morphologies on electrochemical performance across battery components is elucidated in this work. Specifically, 1D mycelial structures form interconnected frameworks ideal for conductive anodes and separators. In contrast, 3D sporocarps provide structural integrity and porosity for robust electrodes, while 0D spores serve as templates for ion flux regulation. This approach reframes fungal materials as dimension-governed templates for designing functional carbon materials, establishing a systematic pathway from intrinsic morphology to device-relevant electrochemical performance.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2026.1737892</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2026.1737892</link>
        <title><![CDATA[From quartzose sandstone to metallurgical grade silicon feedstock for photovoltaics: an integrated sieving, magnetic separation and acid leaching protocol]]></title>
        <pubdate>2026-02-17T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Halima Chaa</author><author>Zohra Krouri</author><author>Ouissam Akli</author><author>Djaouida Allam</author>
        <description><![CDATA[Finding new sources of high purity silica is becoming increasingly important for solar panel manufacturing. Behind quartz, sandstone can be one of the most important sources of silica for advanced technological applications. Despite its abundance in the Earth’s crust, the widespread use of sandstone is limited by the presence of undesirable oxide. This is the case for the studied sandstone rocks, where impurities, particularly iron and aluminum oxide, restrict the suitability of this silica for producing advanced materials. This work presents an optimized multistage purification protocol specifically engineered for quartzose sandstone. We systematically characterize quartzose sandstone from northern Algeria, an abundant yet underexploited sedimentary resource, demonstrating an initial rich silica content but with problematic levels of Fe2O3 and Al2O3 impurities. The core scientific contribution is the establishment of a tailored sequence: granulometric sieving to isolate the optimal 250–400 µm fraction (89.15% SiO2), dry high intensity magnetic separation, and optimized acid leaching using 4 M HCl at 90 °C for 2 h that show leaching efficiency plateaus. Mechanical analysis reveals the 250–400 µm fractions as a liberation sweet spot where quartz grains are maximally freed from the detrital matrix. The results are encouraging, demonstrating that the applied process successfully increased the silica content from an average of 89.15%–99.28%. Furthermore, it significantly reduced the impurity levels, lowering the iron oxide content from 0.27% to 0.02% and the alumina content from 2.46% to 0.02%. By demonstrating the viability of sandstone as a photovoltaic grade feedstock precursor for metallurgical grade silicon (MG-Si) production, which is the essential first step in manufacturing solar grade silicon (SoG-Si) for photovoltaics., this work provides a scalable pathway for diversifying the solar industry’s silica supply chain.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2025.1727201</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2025.1727201</link>
        <title><![CDATA[Mechanically stimulated self-powered electrochemical sensors: principles, classifications, and future directions]]></title>
        <pubdate>2026-01-05T00:00:00Z</pubdate>
        <category>Mini Review</category>
        <author>Jiseung Kang</author><author>Dae-Yong Um</author><author>Sanghyun Lee</author><author>Seonghyeon Kim</author>
        <description><![CDATA[The rapid advancement of self-powered sensor (SPS) technology has enabled continuous and autonomous monitoring across various domains, including biomedical, environmental, and structural applications. Conventional energy-harvesting mechanisms, such as triboelectric, piezoelectric, and electromagnetic induction, produce transient AC-type signals that are prone to drift, attenuation, and poor response under static or low-frequency conditions. Conversely, self-powered electrochemical sensors (SPESs), which operate via mechanically induced modulation of interfacial redox kinetics and ion transport generate stable, quasi-steady-state outputs via Faradaic charge transfer and electrochemical potential variations at the electrode–electrolyte interface. These devices exhibit high sensitivity to both dynamic and static stimuli, presenting operational longevity and material adaptability for long-term sensing applications. Recent advances in hierarchical electrode architectures, multifunctional ionic hydrogels, and hybrid redox systems have further enhanced the energy conversion efficiency, mechanical robustness, and multimodal responsiveness. In this mini-review, we summarize the working mechanisms, material strategies, and classification of mechanically driven SPSs based on the stimulus type. We discuss key challenges such as the limited output power, environmental cross-sensitivity, and reproducibility. Furthermore, we discuss future research directions focused on developing scalable, intelligent, and multimodal self-powered sensing platforms for next-generation IoT and diagnostic systems.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2025.1710858</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2025.1710858</link>
        <title><![CDATA[Influence of slurry mass concentration on the mineralization capacity and mechanical properties of coal-based solid wastes]]></title>
        <pubdate>2025-11-17T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Feng Jin</author><author>Xiaoru Wu</author><author>Zhicheng Liu</author><author>Hao Pan</author><author>Tianqi Shong</author>
        <description><![CDATA[The CO2-mineralized coal-based solid waste backfilling is an effective method for solid waste treatment and carbon sequestration. Both the carbon sequestration capacity, rheological properties and unconfined compressive strength (UCS) of the CO2-mineralized coal-based solid waste backfill material (CO2-CBM) are key evaluation indicators for its application and promotion. To optimize the engineering performance of CO2-CBM, the influence mechanism of slurry mass concentration (65%–73%) on its carbon sequestration capacity, rheological properties and UCS was systematically studied. Study results show that the carbon sequestration rate of CO2-CBM decreases with the increase of slurry mass concentration. Over a period of time, the carbon sequestration amount also decreases with the increase of slurry mass concentration, reaching 82.4 g/kg at the mass concentration of 65%. Both the extension of the standing time and the increase in mass concentration significantly rise the flow resistance of CO2-CBM. When the mass concentration is 73% and the standing time is 30 min, the yield stress and plastic viscosity of CO2-CBM reach 281.84 Pa and 0.95 Pa·s. The results of microscopic analysis show that due to the higher concentration of C-S-H in the slurry, CO2-CBM exhibits a denser structure and lower porosity. Consequently, as the slurry mass concentration increases, the UCS of the CO2-CBM is significantly improved, and the UCS reaches 3.30 MPa at the slurry mass concentration of 73% after a standing time of 28 days. This research provides a basis for optimizing key parameters for the co-processing of solid waste and CO2 in coal mine goaf.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2025.1648638</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2025.1648638</link>
        <title><![CDATA[Assembly of vermiculite/SnO2 composite membranes with high ion selectivity for enhancing osmotic energy conversion performance]]></title>
        <pubdate>2025-09-25T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Yuyang Fu</author><author>Zhibo Chen</author><author>Yating Zhang</author><author>Bichen Xie</author>
        <description><![CDATA[For osmotic energy harvesting based on nanofluidic membranes, aqueous instability, less-than-optimal ion selectivity, and moderately high internal resistance can somewhat restrict its performance advancement. This study develops a novel composite membrane combining 2D SnO2 and vermiculite (VMT) nanosheets to balance permeability and ion selectivity, boosting power density. The optimized membrane achieves an output power density of 0.727 W m-2 using simulated saltwater/river water, offering a promising solution for efficient osmotic energy conversion.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2025.1652733</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2025.1652733</link>
        <title><![CDATA[Next-generation lead-free solar cells with MASnBr3/ZnSnN2 dual absorbers for high efficiency]]></title>
        <pubdate>2025-08-18T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Md. Mehedi Hasan</author><author>Mst. Aysha Siddika</author><author>Md. Feroz Ali</author><author>Md. Rafiqul Islam Sheikh</author><author>Abdullah Al Mamun</author><author>Md Jakir Hossen</author>
        <description><![CDATA[This study presents a next-generation lead-free perovskite solar cell (PVSC) architecture employing a dual-absorber design using MASnBr3 and ZnSnN2 to enhance photovoltaic performance while ensuring environmental sustainability. The proposed structure—FTO/n-ZnO/p-MASnBr3/p-+ZnSnN2/p-++CNTS/Au—was simulated and optimized using SCAPS-1D software. Extensive material and structural optimization was conducted, including selection of electron and hole transport layers as well as tuning absorber thickness, doping concentration, and defect density. The dual-absorber configuration leverages the complementary optical properties of MASnBr3 (bandgap: 1.3 eV) and ZnSnN2 (bandgap: 1.5 eV), enhancing spectral absorption and carrier separation. Optimization of interface properties, series/shunt resistance, and operating temperature further improved the device’s efficiency and stability. The final optimized structure achieved a power conversion efficiency (PCE) of 35.87%, with open-circuit voltage (VOC) of 1.17 V, short-circuit current density (JSC) of 34.39 mA/cm2, and fill factor (FF) of 89.01%. Quantum efficiency analysis confirmed near-unity photon-to-charge conversion across the visible spectrum. This work demonstrates the viability of combining lead-free perovskites with nitride absorbers for high-efficiency, eco-friendly solar technologies and provides a scalable pathway for future experimental validation and commercialization of sustainable photovoltaic systems.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2025.1613997</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2025.1613997</link>
        <title><![CDATA[A mini-review on high-entropy alloy nanomaterials for electrocatalysis: advances and prospects]]></title>
        <pubdate>2025-06-02T00:00:00Z</pubdate>
        <category>Mini Review</category>
        <author>Jiayu Chen</author><author>Anni Wu</author><author>Yumin Zhang</author><author>Yongfeng Xie</author><author>Hu Zheng</author><author>Wei Teng</author>
        <description><![CDATA[High-entropy alloy nanomaterials (HEA-NMs), composed of multiple metallic elements, offer tunable electronic structures, abundant active sites, and excellent stability, making them highly promising for electrocatalysis. This mini-review summarizes their structural effects influencing electrocatalytic behavior, recent advances in synthesis strategies, and electrocatalytic applications, including the hydrogen evolution reaction (HER), oxygen evolution reaction (OER), oxygen reduction reaction (ORR), carbon dioxide reduction reaction (CO2RR), and nitrate reduction reaction (NO3RR). Challenges in synthesis scalability and mechanistic probing are discussed, along with future directions for atomic-level design and data-driven catalyst optimization. HEA-NMs offer a versatile platform for sustainable energy and environmental electrocatalysis.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2025.1604024</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2025.1604024</link>
        <title><![CDATA[Editorial: Functionalization of porous materials for sustainable energy applications]]></title>
        <pubdate>2025-05-08T00:00:00Z</pubdate>
        <category>Editorial</category>
        <author>Vanadium Li</author><author>Ayrat Gizzatov</author><author>Honghong Shi</author><author>Jingbo Louise Liu</author>
        <description></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2025.1567799</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2025.1567799</link>
        <title><![CDATA[Investigation on the activation mechanisms of coal gangue and the corresponding CO2 mineralization potential]]></title>
        <pubdate>2025-03-26T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Lei Zhu</author><author>Chengyong Liu</author><author>Gang Duan</author><author>Zhicheng Liu</author><author>Lingling Shen</author><author>Yuejin Zhou</author><author>Kun Fang</author>
        <description><![CDATA[Coal gangue can be used for CO2 mineralization and then be backfilled into the goaf, which can simultaneously address the long-term management of coal gangue and CO2. Mechanical and composite activation methods were employed to enhance the activity and mineralization potential of coal gangue, and ion leaching experiments were conducted to leach active ions from mechanically-activated coal gangue (MACG) and composite-activated coal gangue (CACG) in this study. Additionally, the evolution of the mineralization potential of MACG and CACG samples under different conditions was explored by inductively coupled plasma-optical emission spectrometry (ICP-OES) tests. The results show that with the extension of milling time, the leaching rates of Ca2+, Mg2+, and K+ of MACG samples gradually increase, while the leaching rate of Ca2+ of CACG samples gradually decrease, and leaching rates of Mg2+ and K+ of CACG samples gradually increase. The activation mechanism of MACG samples was analyzed by the dry powder laser particle size analysis (DPLPSA) and Brunauer-Emmett-Teller (BET). The results show that when the milling time is less than 2 h, the average particle size of MACG samples decreases significantly and the specific surface area increases significantly with the extension of the milling time. However, when the milling time increases to 4 h, the changes in particle size and specific surface area become less significant, leading to an increase in the non-uniformity coefficient and a reduction in porosity. Thermogravimetry (TG) analysis was used to analyze the material components of MACG and CACG samples. It was found that due to the combustion of organic matter, thermal activation after mechanical activation can effectively improve the activity of coal gangue. After mechanical activation, the activity improvement of coal gangue is gradually reduced due to the advance of the transition temperature from metakaolinite to mullite. Finally, MACG and CACG samples before and after mineralization were analyzed by TG tests. The mineralization capacity of MACG samples with a 2-hour milling time was found to be 0.43%, whereas CACG samples achieved a higher mineralization rate of 0.53%.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2025.1559800</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2025.1559800</link>
        <title><![CDATA[Modeling moist air effects and shape memory alloys in elastocaloric devices]]></title>
        <pubdate>2025-03-24T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>D. Zimmermann</author><author>F. Louia</author><author>F. Welsch</author><author>P. Motzki</author><author>S. Seelecke</author>
        <description><![CDATA[Elastocaloric systems, which leverage shape memory alloys (SMAs) to achieve efficient, eco-friendly thermal management, offer a promising alternative to conventional air conditioning technologies. This study presents a simulation-based approach to modeling the effects of moist air and condensation phenomena within these systems. Here, we examine key factors affecting SMA performance, including mechanical behavior and the material’s latent heat characteristics. Moist air, particularly under conditions where temperatures fall below the dew point, introduces condensation and latent heat release, which can influence thermal output in elastocaloric systems. This work develops a comprehensive model that couples the thermomechanical behavior of SMAs with the thermodynamics of moist air, incorporating condensation heat transfer, mass balance, and moisture transport. Through simulations, we quantify the impact of condensation on device level and assess how ambient moisture conditions affect overall heat exchange. The findings enhance our understanding of elastocaloric system performance under real-world conditions, contributing to the advancement of sustainable and modern technologies.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2025.1563997</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2025.1563997</link>
        <title><![CDATA[Elastocaloric can cooler: an exemplary technology transfer to use case application]]></title>
        <pubdate>2025-03-24T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>L. Ehl</author><author>N. Scherer</author><author>D. Zimmermann</author><author>I. Trofimenko</author><author>P. Molitor</author><author>S.-M. Kirsch</author><author>F. Louia</author><author>P. Motzki</author>
        <description><![CDATA[The elastocaloric effect offers a promising alternative to conventional compressor-based heating and cooling systems. This technology leverages solid-state phase transformations with high energy densities, eliminating the need for environmentally harmful refrigerants. As a result, elastocaloric systems can be developed for both heating and cooling applications that are sustainable, highly efficient, and scalable. In this study, the first elastocaloric “mini-fridge” operating under tensile load is developed, using air as heat transfer medium. This system is based on the world’s first continuously operating air-to-air elastocaloric machine demonstrator. The primary focus of this study is to investigate the transition from a generic technology demonstrator to an application-oriented system. A simulation tool enables investigation and optimization of various machine parameters such as material dimensions, load profiles, and latent heats for the intended application. The application targeted in this study is a “mini-fridge” designed to cool a standard 0.25 L beverage can. Shape memory alloy wire bundles are subjected to loading and unloading cycles by a patented energy converter. To effectively harness the latent heat released during phase transformation, the air must be optimally directed over the wire bundles. The cooling process is achieved by continuously circulating air around the bundles, progressively cooling a volume. The simulation tool is employed to determine the optimal geometric and process parameters for this system. The study aims to develop the first continuously operating elastocaloric “mini-fridge” with an internal cooling volume. To validate the entire setup, the inner chamber is equipped with temperature sensors to monitor the cooling performance. These sensors are strategically placed along the axis of rotation to measure the temperature as air enters and exits the chamber. The initial measurements achieved a temperature difference of approximately 3.5 K within the cooling chamber versus a simulated value 8.7 K, which did not include all possible losses present in the system. The simulation suggests a system COP at steady state of 5.8, which must be experimentally verified in future work.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2025.1375558</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2025.1375558</link>
        <title><![CDATA[Potential-step chronocoulometry for robust analysis of charge-transport and thermoelectric behaviors of conducting polymers]]></title>
        <pubdate>2025-03-19T00:00:00Z</pubdate>
        <category>Review</category>
        <author>Ichiro Imae</author>
        <description><![CDATA[Since the groundbreaking discovery of polyacetylene films in the 1960s and subsequent efforts to enhance their electrical conductivity through halogen doping, several conductive π-conjugated polymers have been developed and applied in the fabrication of smart windows, organic photovoltaic cells, lithium-ion batteries, and other optoelectronic and electrical devices. Recently, the potential of these polymers for use in thermoelectric devices toward waste-heat recovery has drawn considerable attention. Given that the electrical properties of conducting polymers are strongly influenced by their doping state, the precise control of this state and accurate estimation of the doping level (charge density, i.e., the number of injected charges per unit volume) are of high importance. This review outlines the methods used to precisely control the doping state of conducting polymers and accurately determine their charge density, with a focus on potential-step chronocoulometry (PSC). Moreover, this paper highlights the recent progress in the application of PSC for analyzing charge-transport and thermoelectric properties. Challenges remain in the quantitative accuracy of electrochemical measurements, the applicability to a broader range of polymers, and the ability to distinguish between different charge carriers. Future research could resolve these issues and lead to improved understanding of charge transport and thermoelectric properties, paving the way for the development of advanced materials for thermoelectric applications.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2025.1541101</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2025.1541101</link>
        <title><![CDATA[Addressing energy challenges: sustainable nano-ceramic electrolytes for solid-state lithium batteries by green chemistry]]></title>
        <pubdate>2025-02-28T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Sai Raghuveer Chava</author><author>Robert Luckett</author><author>Sajid Bashir</author>
        <description><![CDATA[The escalating demand for high-performance, safe energy storage devices has propelled the advancement of solid-state battery (SSB) technology. SSBs can supplant traditional liquid electrolyte-based Li-ion batteries by offering higher theoretical capacities and enhanced safety through solid-state electrolytes. However, challenges like dendritic lithium growth and inadequate solid-solid interfaces impede their practical application. This study aims to overcome these barriers by enhancing the ionic conductivity of ceramic-based solid-state electrolytes by incorporating nanoscale multicomponent halides. Utilizing green chemistry principles, we synthesized composite electrolytes based on Li₃InCl₆, doped with fluorine (F), cerium (Ce), and molybdenum (Mo). Among these, the F-, Ce-, and Mo-doped Li₃InCl₆ electrolytes contributed uniquely to enhancing ionic conductivity. Mo-doping improved most substantially, reaching an average ionic conductivity modal value of 0.30 S cm⁻1 (Rangle 0.15,0.46) S cm−1;± 0.13 S cm⁻1, comparable to commercial liquid electrolytes. F doping enhanced lattice stability and facilitated Li⁺ ion mobility, while Ce doping improved structural integrity and reduced interfacial resistance. Comprehensive structural characterization confirmed the successful incorporation of dopants and favorable modification of the crystal lattice, facilitating enhanced Li⁺ ion mobility. Electrochemical performance evaluations using symmetrical half-cells demonstrated reduced charge transfer resistance and improved cycling stability, particularly in the Mo-doped variants. These findings underscore the effectiveness of molybdenum doping in mitigating interfacial resistance and promoting reliable ion transport in SSBs. Toxicity assessments revealed that using water as a solvent and natural extracts minimized the environmental footprint, aligning with sustainable synthesis practices. Our green nano-engineering approach not only advances the performance of solid-state electrolytes but also aligns with sustainable synthesis practices, paving the way for developing efficient and eco-friendly energy storage solutions. Additionally, our green nano-engineering approach was evaluated against traditional synthesis methods, demonstrating a 40% reduction in energy consumption and a 75% decrease in hazardous waste generation. This manuscript highlights the pivotal role of doped Li₃InCl₆ electrolytes in addressing current limitations of SSB technology, thereby contributing to the future of safe and high-capacity energy storage systems.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2024.1500015</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2024.1500015</link>
        <title><![CDATA[Preparation of polymer hollow microsphere filled epoxy resin-based syntactic foam material and its performance analysis]]></title>
        <pubdate>2024-12-02T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Wei Xue</author><author>Yi Feng</author><author>Jian Wang</author><author>Zumin Fang</author><author>Jiawen Shen</author><author>Yunfan Ma</author><author>Yueru Wang</author><author>Hechen Liu</author><author>Le Li</author>
        <description><![CDATA[To explore sound-absorbing and flame-retardant materials that meet the requirements for double-shielded and double-insulated Faraday cages, polymethyl methacrylate (PMMA) microspheres were incorporated into epoxy resin-based syntactic foam materials for testing and analysis. The addition of PMMA microspheres was found to enhance the electrical, mechanical, sound-absorbing, and flame-retardant properties of the syntactic foam, providing a potential reference for applications in high-voltage hall shielding and sound absorption. Syntactic foams with four concentrations of PMMA microspheres (0%, 0.5%, 1%, and 2%) were prepared. High-voltage breakdown testing, impedance tube testing for sound absorption coefficient, cone calorimetry for flame-retardant performance, and tensile and bending tests were conducted. Results showed that as the concentration of PMMA microspheres increased, improvements were observed in the tensile, bending, flame-retardant, and sound absorption properties of the syntactic foams, while breakdown strength decreased. These findings provide valuable insights into the application of syntactic foam materials in double-insulation, double-shielded Faraday cages.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2024.1441357</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2024.1441357</link>
        <title><![CDATA[Risk assessment of abnormal pressure zones with a focus on shallow gas pockets based on surface gas logging data and statistical relationships]]></title>
        <pubdate>2024-11-15T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Omid Hazbeh</author><author>Meysam Rajabi</author><author>Sahar Esmaeili Korani</author><author>Hamzeh Ghorbani</author><author>Bahman Soleimani</author><author>Rahul Gajbhiye</author>
        <description><![CDATA[The assessment of alterations in hydrocarbon components preserved in reservoirs is important for oil field management and drilling procedures. Drilling fluid analysis yields valuable insights into the reservoir fluid. This study focuses on identifying and quantifying shallow gas basins in the Azadegan oil field. Risk assessment of abnormal pressure zones with a focus on shallow gas pockets based on surface gas logging data and statistical relationships is also a key aspect of this research. Shifts in the C1 gas ratio to other gas components signify a notable peak in the Asmari Formation. Consistency among various wetness (Wh), balance (Bh), and character (Ch) indices suggests that the Aghajari and Gachsaran formations potentially harbor gas and contain some heavy or residual oil with limited production potential. However, the Asmari Formation shows the potential for natural gas production, while the Gurpi Formation has the potential for wet gas or condensate. Pixler parameters were computed and plotted to affirm the results of other parameters. The investigation of stratigraphic columns for component changes and lithology reveals that lithology plays a pivotal role in preserving valuable fluids. The upper section of the Aghajari Formation, primarily composed of shale-evaporite horizons, exhibits lower frequency compared to its lower part. The Gachsaran Formation displays an exceptional ability to preserve components in anhydrite sections. Although Asmari has a high accretion ratio, the Chilean calcareous sandstone horizons are more prominent in the upper part of the Gurpi Formation. The structural model includes humpback microstructures as controls for shallow gas pockets and component accumulation. Evaporite and shale layers significantly influence the movement of these components across different horizons. The 3D model illustrates migration from the Gurpi Formation to the Aghajari Formation, as both formations serve as sources due to the propagation paths leading to the Pabdeh and Gurpi Formations.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2024.1454922</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2024.1454922</link>
        <title><![CDATA[Optimization of entrainment and interfacial flow patterns in countercurrent air-water two-phase flow in vertical pipes]]></title>
        <pubdate>2024-11-01T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Yongzhi Wang</author><author>Feng Luo</author><author>Zichen Zhu</author><author>Ruijie Li</author><author>Mohammad Sina</author>
        <description><![CDATA[This study investigates countercurrent air-water two-phase flow in vertical pipes with inner diameters of 26 mm and 44 mm and a height of 2000 mm, under controlled conditions to eliminate heat and mass transfer. Cutting-edge techniques were employed to measure the liquid film thickness (δ) and entrainment (e) within the annular flow pattern. The methodology involved a systematic comparative analysis of experimental results against established models, identifying the most accurate methods for predicting flow behavior. Specifically, the Schubring et al. correlation was found to most accurately predict e in 26 mm pipes, while the Wallis correlation was more accurate for 44 mm pipes. Additionally, interfacial shear stress was analyzed, confirming the high precision of the δ and e parameters. This research enhances the understanding of countercurrent air-water two-phase flow by providing reliable estimation methods for different pipe diameters and emphasizes the significance of accurately determining interfacial shear stress. Key findings include the identification of the most accurate models for different pipe sizes and addressing challenges in measuring δ and e under controlled conditions. The study’s novelty lies in its comprehensive comparative analysis of existing models, leading to improved predictions of flow dynamics in vertical pipes, thereby contributing valuable insights into two-phase flow behavior in geosciences and environmental engineering.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2024.1488471</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2024.1488471</link>
        <title><![CDATA[Editorial: Materials for next-generation energy conversion and storage]]></title>
        <pubdate>2024-09-10T00:00:00Z</pubdate>
        <category>Editorial</category>
        <author>Soubantika Palchoudhury</author><author>Jaison Jeevanandam</author><author>Rajan Jose</author>
        <description></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2024.1375977</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2024.1375977</link>
        <title><![CDATA[Hydrogen storage ability of hexagonal boron nitride]]></title>
        <pubdate>2024-06-13T00:00:00Z</pubdate>
        <category>Mini Review</category>
        <author>Andrey M. Kovalskii</author><author>Anton M. Manakhov</author><author>Pavel A. Afanasev</author><author>Zakhar I. Popov</author><author>Andrei T. Matveev</author><author>Abdulaziz S. Al-Qasim</author>
        <description><![CDATA[The development of hydrogen energy is capable of solving a number of important issues that modern society is facing, including global warming and various environmental impacts. Currently, there is an intensive search for natural sources of hydrogen as well as low-carbon techniques for mass production of hydrogen from natural gas, associated petroleum gas, and water. In parallel, efforts to develop technologies for the subsequent management of hydrogen are underway, and the creation of its safe and efficient storage is one of the highest priority goals. For the transportation and storage of hydrogen today, a number of solutions are offered, each of which has both positive and negative aspects. The boron nitride family of materials with high thermal and chemical stability, variability of morphologies, and flexibility of structure has been considered as a candidate for efficient hydrogen storage. This review offers to familiarize readers with the progress in the research and application of hexagonal boron nitride (h-BN), as well as BN-based materials in comparison with other materials, as promising hydrogen storage. Experimental and theoretical data obtained for different morphologies and internal structures were reviewed in relevance to the material`s sorption capacity with respect to hydrogen. Various approaches to improve the efficiency of hydrogen storage were analyzed, and the highest storage capabilities published were mentioned. Thus, BN-based materials are very promising as hydrogen storage, even for an automotive application, but the development of new mass production technologies should be carried out.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2024.1383286</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2024.1383286</link>
        <title><![CDATA[Performance experiment of ultra high temperature cementing slurry system]]></title>
        <pubdate>2024-04-24T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Qiang Zou</author><author>Xu Chen</author><author>Shiming Zhong</author><author>Dan Yi</author><author>Liankai Liu</author>
        <description><![CDATA[Introduction: The escalating pursuit of oil and gas reserves in China has led to increasingly deep and ultra-deep well drilling, encountering extreme temperatures that challenge the heat resistance capabilities of cement slurries. This study addresses the critical need for high-performance cement slurries capable of withstanding ultra-high temperatures during drilling and completion operations.Methods: A novel ultrahigh temperature conventional density (UHTE) cement slurry was formulated by incorporating high-temperature-resistant additives, namely DRF-1S and DRH-2L. An indoor testing framework was established to assess the slurry’s performance across various parameters: Evaluating the slurry’s ability to maintain uniform consistency over time. Measuring the amount of free water separated from the slurry under simulated downhole conditions. Assessing the slurry’s transition from fluid to solid state over time. Determining the compressive strength and other mechanical attributes after curing at elevated temperatures.Results: The experimental findings revealed the following: An optimal silica sand dosage of 50% was found to enhance the overall performance of the UHTE cement slurry. The developed UHTE cement system, fortified with DRF-1S and DRH-2L, demonstrated effective functionality within a temperature range of 180°C to 210°C, representing a significant advancement in high-temperature resistance. The slurry maintained API water loss below 100 mL, ensuring minimal fluid loss during placement. Adjusted thickening time allowed for adequate pumping and placement without premature setting. Settlement stability was maintained below 0.04 g/cm3, indicating excellent homogeneity and stability. Incorporation of the anti-decay material DRB-3S ensured a 28-day compressive strength exceeding 50 MPa at 210°C, signifying robust structural integrity under extreme thermal conditions.Discussion: This research provides a robust foundation for the practical application of UHTE cementing technology in ultra-high temperature environments. The successful development of the UHTE cement slurry system, characterized by its superior temperature resistance, controlled water loss, optimized thickening behavior, and exceptional mechanical properties, paves the way for field trials and further enhancements. Future work will involve testing the effectiveness of the new additive combination under actual downhole conditions and refining the formulation to develop an even more advanced UHTE cementing additive. These advancements will contribute to enhanced wellbore integrity, improved drilling efficiency, and increased safety in deep and ultra-deep oil and gas exploration endeavors in China.]]></description>
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        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2024.1388695</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2024.1388695</link>
        <title><![CDATA[Highly defective NiFeV layered triple hydroxide with enhanced electrocatalytic activity and stability for oxygen evolution reaction]]></title>
        <pubdate>2024-04-18T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Xi-Yuan Li</author><author>Lin-Cheng Xu</author><author>Yue Wang</author><author>Yong Yan</author><author>Ying-Jie Feng</author><author>Fan Li</author>
        <description><![CDATA[Oxygen evolution reaction (OER) is one of the most important components of various electrochemical systems such as water splitting, metal air batteries, and carbon dioxide reduction. However, the four-electron process of OER suffers from intrinsically sluggish kinetics, which contributes to significant overpotential in the electrochemical system. Herein, highly defective NiFeV layered triple hydroxide (LTH) catalyst was efficiently prepared using a one-step hydrothermal method. The crystal structure, electronic structure, and surface composition of NiFeV LTH were characterized by X-ray diffraction and photoelectron spectroscopy. Moreover, NiFeV LTH demonstrated a superior OER catalytic performance with-low overpotential (158 mV @10 mA·cm-2), related small Tafel slope (102.3 mV·dec−1), and long-term stability at a high current density of 100 mA·cm-2. In situ Raman spectroscopy was applied to investigate the surface reconstruction during the OER process. It is revealed that Ni species were the most active sites at low overpotential, with the potential increasing subsequently Fe and V gradually participates in the catalytic reaction, the Fe and Ni species as OER catalytic active sites lead to the excellent OER catalytic activity of NiFeV LTH, and inhibited the further dissolution of high-valence NiOOH at high overpotential. The mechanism induced the outstanding activity and stability at high current densities in NiFeV LTH system. Dissolution of vanadium excited the active sites of NiFeV LTH synthesized by hydrothermal method which promoted both activity and stability, while the changes of surface species at different OER potentials were detected by in situ Raman spectroscopy.]]></description>
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