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- W266717813 abstract "Understanding PEFC component durability of well-humidified stack/cell designs may be as important as understanding the problem in situations where a PEFC is significantly under-humidified, such as in a dry cathode feed or low operating current densities. When operating within the 'over-saturated' gas feed regime above 1 A/cm{sup 2} current density, the chromium in a binary alloy catalyst (Pt{sub 3}Cr) of a Hydrogen-Air PEFC has been found to migrate from cathode to anode during the course of life testing (determined by laser ablation ICPMS). In situ CV measurement of electrochemically-active catalyst surface area shows a continuous decrease, revealing that catalyst agglomeration may be a major cause of MEA degradation during middle-term life tests (i.e. {le}2000 hours) under high humidity conditions. Membrane degradation is confirmed by the existence of fluoride and sulfate anions in the cathode water analyzed by ion chromatography. SEM observation of the surface of a tested MEA suggests the loss of catalyst clusters and possible dissolution of recast Nafion{reg_sign} ionomer." @default.
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- W266717813 date "2004-01-01" @default.
- W266717813 modified "2023-09-23" @default.
- W266717813 title "Correlation of MEA structural changes and performance during the life test of a polymer electrolyte fuel cell" @default.
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