Edgar Cruz Ortiz , Niklas van Treel , Susanne Koch , Severin Vierrath , Melanie Bühler
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引用次数: 0
摘要
聚合物电解质膜电解槽的可靠运行需要充分了解电池组件周围的影响。这项工作的重点是电池组装过程中膜电极组件(MEA)的压缩,它对电池的性能、安全性和电解槽的使用寿命有很大影响。在这项工作中,我们分析了增加 MEA 压缩对膜在流场陆地和通道区域下变形的影响,并将结构变化与电池性能变化联系起来。通过过电位分解分析,阐明了电池压缩导致膜变形所造成的主要损失,并对所用催化剂涂层膜(CCM)的低温截面进行了结构分析。根据这些结果,本研究中使用的电池设计的最佳电池压缩率为 30% 至 40%,以平衡欧姆过电位与质量传输过电位的相反趋势。此外,研究还表明,压缩膜不会流向流场的通道区域,而是流向多孔传输层的孔隙。
The effect of compression on PEM Electrolyzer membrane electrode Assemblies
Reliable operation of polymer electrolyte membrane electrolysers requires a sound understanding of the effects surrounding the cell assembly. This work focues on the compression of the membrane electrode assembly (MEA) during cell assembly, which strongly influences cell performance, safety and lifetime of the electrolyser. In this work, we analysed the effect of increasing MEA compression on membrane deformation under the flow-fields land and channel regions and correlated structural changes to changes in cell performance. Via an overpotential break-down analysis, the main losses caused by membrane deformation due to cell compression were elucidated, supported by a structural analysis of cryogenic cross-sections of the used catalyst coated membranes (CCMs). Based on these results, an optimal cell compression between 30 and 40 % for the cell design used in this work to balance opposite trends of ohmic vs. mass transport overpotentials. In addition it was shown that the compressed membrane does not flow into the channel areas of the flow field, but rather into the pores of the porous transport layer.
期刊介绍:
The Journal of Power Sources is a publication catering to researchers and technologists interested in various aspects of the science, technology, and applications of electrochemical power sources. It covers original research and reviews on primary and secondary batteries, fuel cells, supercapacitors, and photo-electrochemical cells.
Topics considered include the research, development and applications of nanomaterials and novel componentry for these devices. Examples of applications of these electrochemical power sources include:
• Portable electronics
• Electric and Hybrid Electric Vehicles
• Uninterruptible Power Supply (UPS) systems
• Storage of renewable energy
• Satellites and deep space probes
• Boats and ships, drones and aircrafts
• Wearable energy storage systems