Hydration state diagnosis in fractal flow-field based polymer electrolyte membrane fuel cells using acoustic emission analysis
Hydration state diagnosis in fractal flow-field based polymer electrolyte membrane fuel cells using acoustic emission analysis
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DOI：
10.1016/j.enconman.2020.113083
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发表时间：
2020-09-15
影响因子：
10.4
通讯作者：
Coppens, M. -O.
中科院分区：
文献类型：
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作者：
Bethapudi, V. S.;Hack, J.;Coppens, M. -O.
评价水管理技术是诊断聚合物电解质膜燃料电池（PEMFC）性能的关键。声发射作为极化的函数（AEfP）最近被引入作为一种非侵入性、非破坏性的方法来分析在极化期间PEMFC内部的水生成和去除。AEfP被证明提供了独特的洞察传统PEMFC内的水管理，并将其与电池性能相关联。在这里，AEfP是用来衡量分形PEMFC的性能，通过评估他们内部的水合条件。这是通过探测两种不同的基于分形流场的PEMFC，即1路和2路分形PEMFC内的水动力学，并测量从它们产生的相应的声学活动。在相对潮湿（70%RH）和完全加湿（100%RH）的反应物相对湿度（RH）条件下对分形PEMFC进行AEFP。在2路分形PEMFC，而不是1路分形PEMFC，在不同的操作条件下，它产生的相对较高的声活性，证明了洪水。通过极化曲线、阻抗测试和恒电流（电流保持）测量，提供了在不同条件下双向分形流场中泛洪的确证证据。
Techniques for evaluating water management are critical to diagnose the performance of polymer electrolyte membrane fuel cells (PEMFCs). Acoustic emission as a function of polarisation (AEfP) has been recently introduced as a non-invasive, non-destructive method to analyse the water generation and removal inside a PEMFC during polarisation. AEfP was shown to provide unique insight into water management within a conventional PEMFC and correlating it to cell performance. Here, AEfP is used to characterise the performance of fractal PEMFCs by evaluating the hydration conditions inside them. This is achieved by probing the water dynamics inside two different fractal flow-field based PEMFCs, namely 1-way and 2-way fractal PEMFCs, and measuring the corresponding acoustic activity generated from them. AEfP is performed on the fractal PEMFCs under relatively humid (70% RH) and fully humidified (100% RH) reactant relative humidity (RH) conditions. Flooding in the 2-way fractal PEMFC, as opposed to the 1-way fractal PEMFC, is demonstrated under different operating conditions by the relatively higher acoustic activity it generates. Corroborating evidence of flooding in the 2-way fractal flow-field under different conditions is provided by its polarisation curves, impedance tests and galvanostatic (current hold) measurements.