期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 123, 期 31, 页码 18844-18853出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.9b05005
关键词
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资金
- NEDO program, KAKENHI [26288005, 18H01940]
- Kao Foundation for Arts and Sciences
- PRESTO
- Materials Research by Information Integration initiative (MI<SUP>2</SUP>I) project of the Support Program for Starting Up Innovation Hub
- Japan Science and Technology Agency (JST)
Catalyst degradation at the cathode of a membrane electrode assembly (MEA) remains a critical issue for practical polymer electrolyte fuel cell (PEFC) operation, but such wet systems impede detailed visualization of degradation events in the cell during its operation. In this work, for the first time, operando spectroimaging (X-ray absorption near-edge structure-computed tomography) was used to produce clear three-dimensional (3D) images of the morphology, Pt and Co distributions, Co/Pt atomic ratio, and Pt valence state of a Pt-Co/C cathode catalyst in a PEFC MEA before and after performing a PEFC-accelerated degradation test. The infographic approach combining the operando spectroimaging and unsupervised learning of the 3D images revealed a catalyst degradation mechanism with different and negligible migration of the Pt catalyst in local parts of the MEA.
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