The influence of hydrogen- and cation-underpotential deposition on oxide-mediated Pt dissolution in proton-exchange membrane fuel cells
作者： Seokkoo Kim , Jeremy P. Meyers
DOI: 10.1016/J.ELECTACTA.2011.07.031
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摘要: Abstract In order to fully understand the influence of a lower potential limit on platinum dissolution and likely mechanism for mass surface-area loss under cycling conditions, Pt catalyst in N 2 -saturated 0.5 M H SO 4 solution was examined using an electrochemical quartz nanobalance (EQCN) flow cell, rotating ring-disk electrode (RRDE) inductively coupled plasma spectroscopy (ICP-MS). Due observation that limit, which coincides with hydrogen under-potential (H UPD ) region, results decrease rate, cations capable interfering process (Zn 2+ , Li + Na K Cd were introduced solution. Larger rates observed presence these during despite apparently negligible effects behavior more positive limits or oxide formation stripping. It found quantity soluble species produced reduction PtO proportional charge associated stripping at disk RRDE experiment.
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