An opinion on catalyst degradation mechanisms during catalyst support focused accelerated stress test (AST) for proton exchange membrane fuel cells (PEMFCs)

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Abstract

Accelerated stress test (AST) protocol meant to study the durability of catalyst support in a polymer electrolyte membrane fuel cell (PEMFC) electrode has been critically evaluated. For nanoparticulate catalysts supported on high surface area conductive materials (e.g. Pt/C), potential cycling meant to study the support durability causes significant impact on the catalyst particles presumed to be passivated due to formation of oxide layer. X-ray diffraction (XRD) patterns of pre-AST and post-AST samples suggest significant change in crystallite size during potential cycling between 1.0 and 1.6 V (vs. RHE), which may be considered to growth induced by dissolution/redeposition rather than particle growth through agglomeration due to support corrosion. Significant (∼50%) electrochemical surface area loss due to catalyst particle growth during support corrosion AST should be taken into account while development/screening of durable catalyst supports. To reduce such contribution, frequent observation cycle should be minimized.
OriginalsprogEngelsk
TidsskriftApplied Catalysis B: Environmental
Vol/bind239
Sider (fra-til)636-643
ISSN0926-3373
DOI
StatusUdgivet - dec. 2018

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