催化作用
电化学
材料科学
电解质
阴极
降级(电信)
化学工程
质子交换膜燃料电池
贵金属
电极
化学
有机化学
计算机科学
电信
工程类
物理化学
作者
Rifael Z. Snitkoff-Sol,Ariel Friedman,Hilah C. Honig,Yan Yurko,Alisa Kozhushner,Michael J. Zachman,Piotr Zelenay,Alan M. Bond,Lior Elbaz
出处
期刊:Nature Catalysis
[Springer Nature]
日期:2022-02-24
卷期号:5 (2): 163-170
被引量:92
标识
DOI:10.1038/s41929-022-00748-9
摘要
Advances in the development of precious-group metal-free (PGM-free) catalysts for the oxygen reduction reaction (ORR) in fuel cell cathodes have produced active catalysts that reduce the performance gap to the incumbent Pt-based materials. However, utilization of state-of-the-art PGM-free catalysts for commercial applications is currently impeded by their relatively low durability. Methods designed to study catalyst degradation in the operation of fuel cells are therefore critical for understanding durability issues and, ultimately, their solutions. Here we report the use of Fourier-transform alternating current voltammetry as an electrochemical method for accurate quantification of the electrochemically active site density of PGM-free cathode catalysts, and to follow their degradation in situ during the operation of polymer electrolyte fuel cells. Using this method, we were able to quantify the electrochemical active site density, which will enable the elucidation of degradation mechanisms of PGM-free ORR catalysts in situ in fuel cells. The implementation of precious metal-free catalysts for the oxygen reduction reaction in fuel cells requires techniques that enable the study of catalyst degradation during operation. Now, an electrochemical method to quantify the density of electrochemically active sites in precious metal-free fuel cell catalysts under in situ conditions is presented.
科研通智能强力驱动
Strongly Powered by AbleSci AI