Quantifying key parameters to provide better understating of microstructural changes in polymer electrolyte membrane fuel cells during degradation: A startup/shutdown case study
Quantifying key parameters to provide better understating of microstructural changes in polymer electrolyte membrane fuel cells during degradation: A startup/shutdown case study
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DOI：
10.1016/j.jpowsour.2023.232807
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发表时间：
2023-04
影响因子：
9.2
通讯作者：
A. Soleymani;L. Bonville;Chunmei Wang;Stephanie Schaefer;James Waldecker;J. Jankovic
中科院分区：
文献类型：
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作者：
A. Soleymani;L. Bonville;Chunmei Wang;Stephanie Schaefer;James Waldecker;J. Jankovic
尽管在提高聚合物电解质膜燃料电池（PEMFC）性能方面取得了很大进展，但它们仍然受到催化剂组分降解的影响。燃料电池电动汽车（FCEV）的多次启动/关闭（SUSD）是催化剂及其载体退化可能导致PEMFC失效的情况之一。因此，在本研究中，实施了关键微观结构参数的全面量化，以将SUSD样品的微观结构变化与性能数据相关联。Pt损失从阴极和粒度分布，以及阴极孔隙率和厚度的变化，进行了量化和讨论的电化学性能。所报告的值表明在35 °C下无保护SUSD操作期间存在严重的碳腐蚀和Pt降解。此外，将操作温度升高至70 °C使降解加剧至阴极催化剂层在低循环次数后塌陷的程度。实施保护方案后，微观结构和电化学表征显示碳腐蚀和Pt降解显著降低。结构-性质-性能关系证实并量化了无保护SUSD操作的影响，但也显示了保护方案如何保护PEMFC的微观结构，从而提高其寿命。
Despite the great progress that has been made in improving the performance of polymer electrolyte membrane fuel cells (PEMFCs), they still suffer from the degradation of catalyst components. Multiple startup/shutdowns (SUSDs) of a fuel cell electric vehicle (FCEV) is one of the situations in which the catalyst and its support degradation can cause PEMFC failure. Hence, in this study, comprehensive quantification of key microstructural parameters was implemented to correlate the microstructural changes with performance data of SUSD samples. Pt loss from the cathode and particle size distribution, as well as cathode porosity and thickness changes, were quantified and discussed with respect to the electrochemical performance. The reported values indicated severe carbon corrosion and Pt degradation during an unprotected SUSD operation at 35 °C. Moreover, the elevation of the operating temperature to 70 °C exacerbated the degradation to the point that the cathode catalyst layer collapsed after a low number of cycles. After a protective protocol was implemented, microstructural and electrochemical characterization showed a significant decrease in carbon corrosion and Pt degradation. The structure-property-performance relationship confirmed and quantified the effects of unprotected SUSD operation, but also showed how the protective protocol will preserve the microstructure of the PEMFC and hence improve its lifetime.