Probing Heterogeneous Degradation of Catalyst in PEM Fuel Cells under Realistic Automotive Conditions with Multi-Modal Techniques,Advanced Energy Materials

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Probing Heterogeneous Degradation of Catalyst in PEM Fuel Cells under Realistic Automotive Conditions with Multi-Modal Techniques
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2021-07-29 , DOI: 10.1002/aenm.202101794
Kaustubh Khedekar ₁ , Morteza Rezaei Talarposhti ₂ , Münir M. Besli ₃ , Saravanan Kuppan ₄ , Andrea Perego ₂ , Yechuan Chen ₂ , Michael Metzger ₄ , Sarah Stewart ₄ , Plamen Atanassov _{1,

2} , Nobumichi Tamura ₅ , Nathan Craig ₄ , Lei Cheng ₄ , Christina M. Johnston ₄ , Iryna V. Zenyuk _{1,

2}

Affiliation

The heterogeneity of polymer electrolyte fuel cell catalyst degradation is studied under varied relative humidity and types of feed gas. Accelerated stress tests (ASTs) are performed on four membrane electrode assemblies (MEAs) under wet and dry conditions in an air or nitrogen environment for 30 000 square voltage cycles. The largest electrochemically active area loss is observed for MEA under wet conditions in a nitrogen gas environment AST due to constant upper potential limit of 0.95 V and significant water content. The mean Pt particle size is larger for the ASTs under wet conditions compared to dry conditions, and the Pt particle size under land is generally larger than under the channel. Observations from ASTs in both conditions and gas environments indicate that water content promotes Pt particle size growth. ASTs under wet conditions and an air environment show the largest difference in Pt particle size growth for inlet versus outlet and channel versus land, which can be attributed to larger water content at outlet and under land compared to inlet and under channel. From X-ray fluorescence experiments Pt particle size increase is a local phenomenon as Pt loading remains relatively uniform across the MEA.

中文翻译：

用多模态技术探索现实汽车条件下 PEM 燃料电池中催化剂的非均相降解

在不同的相对湿度和进料气体类型下，研究了聚合物电解质燃料电池催化剂降解的异质性。在空气或氮气环境中，在潮湿和干燥条件下，对四个膜电极组件 (MEA) 进行加速应力测试 (AST)，持续 30 000 次方电压循环。由于 0.95 V 的恒定电位上限和显着的水含量，在氮气环境 AST 的潮湿条件下观察到 MEA 的电化学活性面积损失最大。与干燥条件相比，在潮湿条件下 AST 的平均 Pt 粒径更大，并且陆地下的 Pt 粒径通常大于通道下。在条件和气体环境中对 AST 的观察表明，水含量促进了 Pt 粒径的增长。潮湿条件和空气环境下的 AST 显示入口与出口和通道与陆地的 Pt 粒径增长差异最大，这可归因于与入口和通道下方相比，出口和陆地下方的含水量更大。根据 X 射线荧光实验，Pt 粒径增加是一种局部现象，因为整个 MEA 上的 Pt 负载保持相对均匀。

更新日期：2021-09-16

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