Journal of Power Sources最新文献_第7页

Mitigating internal strain of nickel-rich layered oxide enabled by microstructure modification 显微结构改性可减轻富镍层状氧化物的内部应变

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2025-04-22 DOI: 10.1016/j.jpowsour.2025.237113

Yan Huang, Fengxia Fan, Chenrui Zeng, Xinxiang Wang, Guilei Tian, Sheng Liu, Pengfei Liu, Chuan Wang, Shuhan Wang, Yang Zhang, Haoruo Xiao, Chaozhu Shu

Nickel-rich layered oxide, as the most promising cathode material for lithium-ion batteries (LIBs), possesses high energy density. Nonetheless, the formation of microcracks as well as the release of lattice oxygen during electrochemical cycling are the main issues facing nickel-rich layered oxide. In this work, by introducing high-valent antimony (Sb) elements into LiNi_0.9Co_0.05Mn_0.05O₂ (NCM) during the lithiation process of Ni_0.9Co_0.05Mn_0.05(OH)₂ hydroxide precursor, the crystal surface energy during particle growth is significantly reduced, regulating the synthesized primary particles with radial alignment. Such a structure could mitigate the accumulation of strain due to the anisotropic lattice expansion and contraction induced by the phase transition during the lithium extraction/insertion process, thus effectively suppressing the generation of microcracks. Meanwhile, the introduction of strong antimony-oxygen covalent bonds into the lattice of the material can restrain the releasing of lattice oxygen and mitigate the structural collapse. Therefore, the 0.5mol% antimony-doped NCM (0.5 S b-NCM) exhibits excellent electrochemical performance, delivering a high initial discharge capacity up to 219.8 mA h/g at 0.1 C, and high capacity retention of 97.09 % over 200 cycles at 1 C. This work presents an effective way to regulate the microstructure to mitigate internal strain and oxygen evolution of nickel-rich cathode materials.

富镍层状氧化物具有较高的能量密度，是锂离子电池最有前途的正极材料。然而，在电化学循环过程中，微裂纹的形成和晶格氧的释放是富镍层状氧化物面临的主要问题。本文在Ni0.9Co0.05Mn0.05(OH)2氢氧化物前驱体的锂化过程中，将高价锑（Sb）元素引入到LiNi0.9Co0.05Mn0.05O2 （NCM）中，显著降低了颗粒生长过程中的晶体表面能，调节合成的初生颗粒呈径向排列。这种结构可以减轻锂提取/插入过程中相变引起的各向异性晶格膨胀和收缩导致的应变积累，从而有效抑制微裂纹的产生。同时，在材料晶格中引入强的锑氧共价键可以抑制晶格氧的释放，减轻结构坍塌。因此，0.5mol%掺锑的NCM （0.5 S b-NCM）表现出优异的电化学性能，在0.1 C下具有高达219.8 mA h/g的高初始放电容量，在1 C下200次循环时具有97.09%的高容量保持率。该研究为调节富镍阴极材料的微观结构以减轻内部应变和析氧提供了有效途径。

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引用次数: 0

Capacity and colour tunability of the electrochromic-supercapacitor electrode based on highly dense rGO-NiO composite nanoflakes 基于高密度氧化钨-氧化镍复合纳米片的电致变色-超级电容器电极的容量和颜色可调性

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2025-04-22 DOI: 10.1016/j.jpowsour.2025.237089

Suhas H. Sutar , Sushama M. Nikam , Apparao A. Mane , Akbar I. Inamdar , Sarfraj H. Mujawar

In response to the global need for sustainable development and reducing environmental pollution, the search for multifunctional technologies that can both conserve energy and protect the environment has gained momentum. Electrochromic devices have emerged as key energy-saving technologies with the additional capability of energy storage. However, optimizing their performance requires innovative approaches such as morphological tuning, elemental doping, and composite material engineering. Therefore, in this study, we present a simple synthesis method for reduced graphene oxide-nickel oxide (rGO-NiO) nanoflake composites using a hydrothermal process with varying concentrations of rGO. The incorporation of rGO significantly enhances the electrochemical performance of nickel oxide, providing a larger specific surface area, improved electrical conductivity, and synergistic effects that enhance the properties of each component. The optimized composite film, which includes 1 mg of graphene oxide, demonstrates outstanding performance with an areal capacitance of 211.68 mF/cm², an optical modulation of 71 %, and fast switching speeds of 7.83/7.45 s. These results highlight the significant potential of tailored composite materials to improve the efficiency and stability of electrochromic supercapacitors. This advancement addresses the evolving needs of our dynamic global environment, moving us closer to a sustainable and energy-efficient future.

为了响应可持续发展和减少环境污染的全球需要，寻求既能节约能源又能保护环境的多功能技术的势头日益增强。电致变色器件具有额外的能量存储能力，已成为关键的节能技术。然而，优化它们的性能需要创新的方法，如形态调谐、元素掺杂和复合材料工程。因此，在本研究中，我们提出了一种简单的水热法合成还原氧化石墨烯-氧化镍（rGO- nio）纳米片复合材料的方法。氧化石墨烯的加入显著提高了氧化镍的电化学性能，提供了更大的比表面积，提高了导电性，并产生了协同效应，提高了各组分的性能。优化后的复合薄膜含有1 mg氧化石墨烯，其面电容为211.68 mF/cm2，光调制率为71%，开关速度为7.83/7.45 s，具有优异的性能。这些结果突出了定制复合材料在提高电致变色超级电容器的效率和稳定性方面的巨大潜力。这一进步满足了我们不断变化的全球环境的不断变化的需求，使我们更接近可持续和节能的未来。

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引用次数: 0

Granular activated carbon tubular microbial fuel cell for decentralized greywater treatment 分散式灰水处理用颗粒活性炭管状微生物燃料电池

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2025-04-22 DOI: 10.1016/j.jpowsour.2025.237121

Carlos Gallardo-Bustos , Natalia Tapia , Ignacio T. Vargas

This study developed a novel scalable tubular design of microbial fuel cells using granular activated carbon (GMFC). The GMFCs were tested over a year of batch-cycle operation for treating synthetic greywater and compared with aerated granular activated carbon biofilters (GBFs). The electrical performance of GMFCs with a non-aerated cathode presented a polarization shift along with high but unstable power densities, whereas, with the aerated cathode, the average power densities were stable. Direct microbial counting using epifluorescence and scanning electron microscopy revealed that GMFCs contain more sessile microorganisms than GBFs, suggesting that electrochemical systems favor biofilms. Ecological indices derived from community analysis suggested that GMFCs provide a less selective environment than GBFs and are more resilient to operation changes. The long-term operation, performance, and adsorption isotherm experiments suggested that the GMFC can use the organic matter adsorbed on the granules for bioregeneration without additional costs, leading to a robust long-term operation.

本研究利用颗粒活性碳（GMFC）开发了一种新型的可扩展管式微生物燃料电池设计。在一年的批量循环运行中，对处理合成灰水的 GMFC 进行了测试，并与充气颗粒活性炭生物过滤器（GBF）进行了比较。采用非充气阴极的 GMFC 电性能出现极化偏移，功率密度高但不稳定，而采用充气阴极的 GMFC 平均功率密度稳定。利用外荧光和扫描电子显微镜进行的直接微生物计数显示，GMFC 比 GBF 含有更多的无柄微生物，这表明电化学系统有利于生物膜。通过群落分析得出的生态指数表明，与 GBF 相比，GMFC 提供的环境选择性更低，对运行变化的适应能力更强。长期运行、性能和吸附等温线实验表明，GMFC 可以利用颗粒上吸附的有机物进行生物再生，而无需额外成本，从而实现稳健的长期运行。

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引用次数: 0

Next-generation Li1.3+xAl0.3AsxTi1.7-x(PO4)3 NASICON electrolytes with outstanding ionic conductivity performance 具有优异离子电导率性能的新一代Li1.3+xAl0.3AsxTi1.7-x(PO4)3 NASICON电解质

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2025-04-22 DOI: 10.1016/j.jpowsour.2025.237103

S. Taoussi , A. Ouaha , M. Naji , K. Hoummada , A. Lahmar , J. Alami , B. Manoun , A. El bouari , H. Frielinghaus , L. Bih

NASICON-type solid electrolytes feature prominently in the improved safety and energy density of solid-state lithium batteries (ASSLBs). Achieving high ionic conductivity in these electrolytes is key to optimizing their performance. In this study, we introduced a new class of NASICON-type materials by doping arsenic into the Li_1.3Al_0.3Ti_1.7(PO₄)₃ framework, creating a series of Li_1.3+xAl_0.3As_xTi_1.7-x(PO₄)₃ phases with varying arsenic content (x = 0, 0.1, 0.2, 0.3), synthesized using the standard solid-state reaction method. X-ray diffraction confirmed the successful formation of the Li_1.3+xAl_0.3As_xTi_1.7-x(PO₄)₃ phases, which was further validated by Rietveld refinement. Structural analyses through FT-IR, Raman spectroscopy, NMR, and ICP-AES studies validate the effective incorporation of arsenic into the lattice. Among the different compositions, Li_1.5As_0.2Al_0.3Ti_1.5(PO₄)₃ phase stood out due to its high relative density of 89 % and its pore-free microstructure, as observed through scanning electron microscopy results, revealing the largest grain and crystallite size. Notably, doping with arsenic resulted in a significant enhancement in ionic conductivity, increasing from 5.34 × 10⁻⁵ Ω⁻¹ cm⁻¹ for Li_1.3Al_0.3Ti_1.7(PO₄)₃ to 8.57 × 10⁻⁴ Ω⁻¹ cm⁻¹ for the Li_1.5As_0.2Al_0.3Ti_1.5(PO₄)₃ at 25 °C. With a lithium transference number of 0.99, and a conduction mechanism largely unaffected by changes in temperature or composition, demonstrating its suitability as a promising candidate for solid electrolyte applications.

nasicon型固体电解质在提高固态锂电池（ASSLBs）的安全性和能量密度方面具有突出的特点。在这些电解质中实现高离子导电性是优化其性能的关键。在本研究中，我们将砷掺杂到Li1.3 al0.3 ti1.7 (PO4)3框架中，建立了一系列不同砷含量（x = 0,0.1, 0.2, 0.3）的Li1.3+xAl0.3AsxTi1.7-x(PO4)3相，采用标准固相反应法合成了一类新的nasicon型材料。x射线衍射证实Li1.3+xAl0.3AsxTi1.7-x(PO4)3相成功形成，Rietveld细化进一步验证了这一点。通过FT-IR，拉曼光谱，核磁共振和ICP-AES研究的结构分析验证了砷有效结合到晶格中。在不同的成分中，Li1.5As0.2Al0.3Ti1.5(PO4)3相因其高达89%的相对密度和无孔的微观结构而引人注目，通过扫描电镜观察，显示出最大的晶粒和晶粒尺寸。值得注意的是，砷的掺杂导致离子电导率显著提高，在25℃时，Li1.3Al0.3Ti1.7(PO4)3的离子电导率从5.34 × 10−5 Ω−1 cm−1增加到Li1.5As0.2Al0.3Ti1.5(PO4)3的8.57 × 10−4 Ω−1 cm−1。锂转移数为0.99，其传导机制基本不受温度或成分变化的影响，证明了其作为固体电解质应用的有前途的候选者的适用性。

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引用次数: 0

Transfer-enhanced cathode with noncorrosive inorganic-based composite additive for durable proton exchange membrane fuel cells 耐用质子交换膜燃料电池用无腐蚀性无机基复合添加剂转移增强阴极

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2025-04-22 DOI: 10.1016/j.jpowsour.2025.237063

Katie Heeyum Lim , Jungsoo Hwang , Ohsub Kim , Jihyun Kim , Hyoung-Juhn Kim , Dirk Henkensmeier , Sung Jong Yoo , Jin Young Kim , So Young Lee , Young-Gi Yoon , Tae-Young Kim , Chi-Young Jung , Hee-Young Park , Hyun S. Park , Jong Hyun Jang

Conventional cathodes of proton exchange membrane fuel cells (PEMFCs) composed of two components, Pt/C catalyst and ionomer, are cautiously fabricated to achieve efficient electron, ion, and mass transfer through the electrode. However, the degradation of the cathode structure due to carbon support oxidation limits the long-term operation of PEMFCs by interrupting gas transfer through the deformed electrode. This carbon corrosion problem is often addressed by replacing carbon with other catalyst-supporting materials, albeit with limited effects. Herein, we report a new cathode design that incorporates a noncorrosive additive as a third component into traditional PEMFC systems to mitigate cathode degradation, thereby enhancing PEMFC performance and durability. The noncorrosive additive improves PEMFC durability by more than three times compared to fuel cells without the additive in accelerated stress tests (ASTs). Through this simple process, the porous cathode structure maintains its integrity even under severe carbon corrosion, unlike conventional cathodes, thereby ensuring sustained transfer pathways for ions and gas fuels throughout the electrode. Moreover, the initial PEMFC performance increases by 13.6 %, attributed to the intensified porous networks in this new cathode design.

质子交换膜燃料电池（pemfc）的传统阴极由Pt/C催化剂和离子单体两种组分组成，为了实现高效的电子、离子和质量通过电极的传递，需要精心制作。然而，由于碳载体氧化导致阴极结构的退化，通过变形电极中断气体传递，限制了pemfc的长期运行。这种碳腐蚀问题通常通过用其他催化剂支持材料代替碳来解决，尽管效果有限。在此，我们报告了一种新的阴极设计，将一种无腐蚀性添加剂作为第三组分加入传统的PEMFC系统中，以减轻阴极降解，从而提高PEMFC的性能和耐久性。在加速应力测试（ast）中，与不含添加剂的燃料电池相比，无腐蚀性添加剂的PEMFC耐久性提高了三倍以上。通过这个简单的过程，多孔阴极结构与传统阴极不同，即使在严重的碳腐蚀下也能保持其完整性，从而确保离子和气体燃料在整个电极上的持续转移途径。此外，由于这种新型阴极设计中强化了多孔网络，PEMFC的初始性能提高了13.6%。

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引用次数: 0

Sodiated two-dimensional 2H-ZrO2: Structural, electronic, interfacial and thermoelectric insights for high-performance battery applications 固体二维2H-ZrO2：高性能电池应用的结构、电子、界面和热电见解

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2025-04-22 DOI: 10.1016/j.jpowsour.2025.237065

Nadia Luqman , Masood Yousaf , Qura Tul Ain , Manan Ali

Two-dimensional (2D) materials with excellent carrier mobility and broadband range are instinctively appropriate for next-generation sodium-ion batteries (SIBs). The study presents an innovative anode design leveraging the 2D 2H-ZrO₂ for SIBs. Density functional theory has been employed to investigate the aforementioned anode material properties including theoretical capacity, diffusion barrier energy, and charge transfer of adsorbed system (Na@2H-ZrO₂). Notably, the shift from semiconducting to half metallic nature of 2H-ZrO₂ after Na adsorption facilitates a high electronic conductivity. A minimal lattice change of 0.67 % along with high diffusivity and rapid charge transfer characteristics, as indicated by a low diffusion barrier of 0.9 eV, underscores 2H-ZrO₂ suitability as an anode material. Moreover, an exceptional sodium storage capacity of 435 mAh g⁻¹ is achieved by sodiating both sides of 2H-ZrO₂. The planar charge density difference (PCDD) endorses accumulation of charge density at the interface. Additionally, to evaluate the effectiveness of proposed anode material, thermoelectric properties are calculated over a range of temperatures. Na@2H-ZrO₂ system produces thermoelectric effect at room temperature (300 K). The enhanced Seebeck coefficient, improved electronic conductivity, higher power factor, and increased figure of merit for Na@2H-ZrO₂ not only boost electronic conduction, but also contribute to the overall efficiency of the anode.

具有优异载流子迁移率和宽带范围的二维（2D）材料本能地适用于下一代钠离子电池（sib）。该研究提出了一种利用2D 2H-ZrO2用于sib的创新阳极设计。密度泛函理论被用于研究上述阳极材料的性能，包括理论容量、扩散势垒能和吸附体系的电荷转移（Na@2H-ZrO2）。值得注意的是，在Na吸附后，2H-ZrO2从半导体性质转变为半金属性质，有利于高电子导电性。最小晶格变化为0.67%，同时具有高扩散率和快速电荷转移特性，如0.9 eV的低扩散势垒所示，强调了2H-ZrO2作为阳极材料的适用性。此外，通过调解2H-ZrO2的两侧，实现了435 mAh g−1的特殊钠存储容量。平面电荷密度差（PCDD）支持电荷密度在界面处的积累。此外，为了评估所提出的阳极材料的有效性，在一定温度范围内计算热电性能。Na@2H-ZrO2系统在室温（300 K）下产生热电效应。增强的塞贝克系数、改善的电子导电性、更高的功率因数和Na@2H-ZrO2的优值不仅提高了电子导电性，而且有助于提高阳极的整体效率。

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引用次数: 0

Accelerating the kinetics of zinc-ion diffusion via redox-active polyaniline intercalated vanadium oxide for green durable zinc-ion batteries 绿色耐用锌离子电池中氧化还原活性聚苯胺插层氧化钒加速锌离子扩散动力学

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2025-04-22 DOI: 10.1016/j.jpowsour.2025.237074

Ruhan Zhao , Zhoutai Shang , Xinzhi Wang , Zhijian Li , Rongqian Kuang , Ke Lu , Hong Zhang , Songtao Lu

Layered vanadium pentoxide (V₂O₅) has caused considerable attention owing to rich redox chemistry of vanadium that enables high specific capacities in aqueous zinc batteries. However, it is still confronted with inherent narrow interlayer spacing, poor conductivity and sluggish diffusion kinetics of Zn²⁺ due to the strong electrostatic interactions in layered V₂O₅. Herein, we propose a high-capacity nanosheet cathode by preparing an in-situ intercalation polymerization of Fe(CN)₆⁴⁻-doped polyaniline within the interlayers of V₂O₅ to expand the interlayer spacing and provide abundant active site, which enables highly reversible and ultrafast zinc ions (de)intercalation processes. Especially, the spontaneous formation of zinc ferricyanide Zn_x+1[Fe^III/II(CN)₆] within the polyaniline framework acting as a redox mediator exhibited faster Zn²⁺ (de)intercalation kinetics by catalyzing the reduction of V₂O₅ during discharging process, thereby shortening the Zn²⁺ diffusion path and accelerating its diffusion kinetics. Moreover, this nanosheet cathode can deliver a high specific capacity of 503 mAh g⁻¹ at 0.5 A g⁻¹ and exhibit a capacity retention of 92 % over 3000 cycles at 1.5 A g⁻¹. The remarkable electrochemical performance is attributed to the layered structure of Fe(CN)₆⁴⁻-PANI-V₂O₅ constructed with large interlayer spacing and active filler, which enables the rapid (de)intercalation of zinc ions with a negligible structure change.

层状五氧化二钒（V2O5）由于其丰富的氧化还原化学性质而引起了人们的广泛关注。然而，由于层状V2O5中的强静电相互作用，仍然存在固有的层间距窄、电导率差和Zn2+扩散动力学缓慢的问题。在此，我们提出了一种高容量的纳米片阴极，通过在V2O5的层间制备Fe(CN)64−掺杂聚苯胺的原位插层聚合，以扩大层间间距并提供丰富的活性位点，从而实现高可逆和超快的锌离子（de）插层过程。特别是，作为氧化还原介质的聚苯胺框架内自发生成的铁氰化锌Znx+1[FeIII/II(CN)6]在放电过程中通过催化V2O5的还原，表现出更快的Zn2+ (de)插层动力学，从而缩短了Zn2+的扩散路径，加速了其扩散动力学。此外，该纳米片阴极在0.5 a g−1下可提供503 mAh g−1的高比容量，在1.5 a g−1下可在3000次循环中保持92%的容量。Fe(CN)64−-PANI-V2O5具有层状结构，层间间距大，结构变化小，可以快速（脱）插层，具有显著的电化学性能。

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引用次数: 0

Water transport characteristics in cathode gas diffusion layer of proton exchange membrane fuel cell under dynamic loading 动态负载下质子交换膜燃料电池阴极气体扩散层的水输运特性

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2025-04-22 DOI: 10.1016/j.jpowsour.2025.237138

Cheng Zhu , Huicui Chen , Ruirui Zhang , Pucheng Pei

During the applications of proton exchange membrane fuel cells (PEMFCs) on vehicles, dynamic loads occupy a large proportion of total operating conditions. Additionally, the water-gas transmission under dynamic conditions significantly affects the lifetime. However, most existing simulations of water transport characteristics in the cathode gas diffusion layer (GDL) focus on steady-state conditions. There is a lack of accurate understanding regarding the mechanisms of dynamic water transmission processes within the GDL. Therefore, a dynamic simulation of water transfer characteristics with variable loads was conducted in this study using a one-dimensional fuel cell model and a three-dimensional lattice Boltzmann method (LBM) GDL model. The simulation results showed that current density significantly affects the transport paths in the GDL. The water saturation rises under higher current densities, under both stable and dynamic loads. Under dynamic conditions, higher water pressure and saturation occur in the GDL with higher load changes. Additionally, less time is taken for water to develop in the GDL with higher load changes. This study provides a reference for optimizing control methods of PEMFCs and offers insights for future research on mass transfer under dynamic conditions.

质子交换膜燃料电池（pemfc）在汽车上的应用过程中，动载荷在总运行工况中占有很大的比重。此外，动态条件下的水气输送对寿命有显著影响。然而，现有的阴极气体扩散层（GDL）中水输运特性的模拟大多集中在稳态条件下。关于GDL内动态水传输过程的机制缺乏准确的理解。因此，本研究采用一维燃料电池模型和三维晶格玻尔兹曼方法（LBM） GDL模型对变载荷下的水传递特性进行了动态模拟。仿真结果表明，电流密度对GDL中的输运路径有显著影响。在稳定和动态载荷下，高电流密度下的水饱和度升高。在动力条件下，随着荷载变化的增大，GDL内的水压和饱和度也会增大。此外，在高负荷变化的GDL中，水的形成时间更短。该研究为优化pemfc的控制方法提供了参考，并为未来动态传质研究提供了启示。

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引用次数: 0

Development and experimental performance investigation of a newly designed phosphoric acid fuel cell system 新型磷酸燃料电池系统的研制及实验性能研究

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2025-04-21 DOI: 10.1016/j.jpowsour.2025.237079

Gorkem Kubilay Karayel, Ibrahim Dincer

This study examines the electrochemical and thermal performance of a newly developed phosphoric acid fuel cell (PAFC) system at the cell level, emphasizing electrode material coatings, and the impact of phosphoric acid concentration. Some critical performance parameters, such as temperature, reactant gas flow rates and wt% of the phosphoric acid, are considered and investigated through the experimental tests. Electrochemical assessments, comprising linear sweep voltammetry (LSV) and cyclic voltammetry (CV), are performed to analyze the influence of copper, iron, tin, and nickel coatings on the efficacy of the PAFC. Based on the experiments it shows that the highest recorded voltage values are 697.56 mV and 800.12 mV for non-coated plate and nickel-coated plate at 200°C with 3L/m hydrogen and 10L/m oxygen flow rates, 696.9 mV, 800.12 mV, 812.3 mV, 821.75 mV, and 837.27 mV for nickel-coated plate at 200°C with 2L/m, 3L/m, 4L/m, 5L/m, and 6L/m hydrogen flow rates at constant 10L/m oxygen flow rate, and finally 837.27 mV, 839.93 mV, 841 mV, 844.02 mV at 200°C with 10L/m, 12L/m, 14L/m, and 16L/m oxygen flow rate with constant 6L/m hydrogen flow rate. The energy and exergy efficiencies of the fuel cell are 33%, and 25%, respectively. The present study provides a solid theoretical understanding and a practical validation of the thermally stabilized, membraneless PAFC system optimized for low-cost and scalable energy conversion.

本研究在电池水平上研究了新开发的磷酸燃料电池（PAFC）系统的电化学和热性能，重点研究了电极材料涂层以及磷酸浓度的影响。通过实验考察了温度、反应物气体流速和磷酸的wt%等关键性能参数。电化学评估包括线性扫描伏安法（LSV）和循环伏安法（CV），以分析铜、铁、锡和镍涂层对PAFC效能的影响。基于实验表明,最高记录电压值是697.56 mV和800.12 mV non-coated板和镀镍板在200°C 3 l / m氢和10 l / m氧气流速,696.9 mV, 800.12 mV, 812.3 mV, 821.75 mV,为镀镍板和837.27 mV与2 l / m 200°C, 3 l / m, l / m, 4 5 l / m,和6 l / m氢流速恒定10 l / m氧气流量,最后837.27 mV, 839.93 mV, 841 mV, 844.02 mV在200°C 10 l / m, 12 l / m, 14 l / m,氧气流量为16L/m，氢气流量为6L/m。燃料电池的能量效率和火用效率分别为33%和25%。本研究为低成本和可扩展的能量转换优化的热稳定无膜PAFC系统提供了坚实的理论认识和实践验证。

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引用次数: 0

Current interrupt method for calculating the electrochemical impedance in a solid oxide electrolysis stack 计算固体氧化物电解堆中电化学阻抗的电流中断方法

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2025-04-20 DOI: 10.1016/j.jpowsour.2025.237051

Nathanael Royer, Kerry Meinhardt, Dustin McLarty, Olga A. Marina

In this work the time domain response of Solid Oxide Electrolysis Cells (SOEC) to a current interruption was transformed into the frequency domain using a carrier function Laplace transform, which is fit to the experimental data using a MATLAB Complex Nonlinear Least Squares (CNLS) solver to obtain the complete impedance spectrum. The hardware implementation, consisting principally of a high-speed switch and a fast-logging Analog to Digital Converter (ADC), was assembled and tested using a calibration module to assess the accuracy, repeatability, and speed of acquisition of the prototype device as compared against a calibrated commercial impedance spectrometer. Additionally, the current interrupt device and commercial Frequency Response Analyzer (FRA) were used to acquire the impedance spectra of a four cell SOEC stack with a large, 300 cm², active cell area.

本文采用载波函数拉普拉斯变换将固体氧化物电解槽（SOEC）电流中断时的时域响应转换为频域响应，并利用MATLAB复非线性最小二乘（CNLS）求解器拟合实验数据，得到了完整的阻抗谱。硬件实现主要由高速开关和快速记录模数转换器（ADC）组成，使用校准模块进行组装和测试，以评估原型设备的准确性，可重复性和获取速度，并与校准的商用阻抗光谱仪进行比较。此外，利用当前中断器件和商用频率响应分析仪（FRA）获得了具有300 cm2大有效单元面积的四单元SOEC堆栈的阻抗谱。

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