Stability of platinum based alloy cathode catalysts in PEM fuel cells
Stability of platinum based alloy cathode catalysts in PEM fuel cells
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DOI：
10.1016/j.jpowsour.2005.05.011
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发表时间：
2006-04-21
影响因子：
9.2
通讯作者：
Popov, BN
中科院分区：
文献类型：
--
作者：
Colón-Mercado, HR;Popov, BN
用加速耐久性试验(ADT)评价了碳负载铂(铂)基催化剂的腐蚀和比表面积变化。利用ADT得到的结果与燃料电池中铂基催化剂的性能相关联。在相同的时间域内估算了铂合金催化剂中合金化金属的催化活性和溶解速率。合金金属的溶出量与铂合金催化剂的氧还原反应(ORR)活性有很强的相关性。铂催化剂的活性比表面积降低，ORR活性降低。铂/碳和铂-钴/碳催化剂在ADT和燃料电池测试中表现出相似的行为。用电子探针对燃料电池测试后的膜电极组件进行的横截面研究表明，钴在溶解后扩散到膜中。(C)2005 Elsevier B.V.保留所有权利。
Corrosion and surface area changes of platinum (Pt) based catalysts supported on carbon were evaluated using an accelerated durability test (ADT). The results obtained using the ADT were correlated to the performance of the Pt based catalysts in the fuel cell. The catalytic activity and dissolution rate of the alloying metal from the Pt-alloy catalysts were estimated in the same time domain. A strong correlation was observed between the amount of the alloying metal dissolved and the oxygen reduction reaction (ORR) activity of the Pt-alloy catalysts. The Pt catalyst exhibited loss of active surface area, and a resulting decrease in the ORR activity was observed. The Pt/C and Pt-Co/C catalysts showed similar behavior in both ADT and in the fuel cell testing. Cross-sectional studies by electron microprobe analysis of the membrane electrode assembly after fuel cell testing revealed cobalt dissolution followed by diffusion into the membrane. (c) 2005 Elsevier B.V. All rights reserved.