Time-dependent mass transport for O2 reduction at the Pt | perfluorosulfonic acid ionomer interface

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DOIResolve DOI: http://doi.org/10.1149/2.0051501eel
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TypeArticle
Journal titleECS Electrochemistry Letters
ISSN2162-8726
Volume4
Issue1
PagesF9F12
SubjectDiffusion; Electrodes; Electrolytic reduction; Ionomers; Lanthanum compounds; Microelectrodes; Oxygen; Platinum; Reduction; Electrochemical Generation; Open circuit potential; Oxygen diffusion coefficients; Oxygen reduction reaction; Perfluorosulfonic acid; Perfluorosulfonic acid ionomers; Potential step measurements; Solid-state electrochemical cells; Interface states
AbstractChronoamperometric analysis of the oxygen reduction reaction (ORR) at Pt microelectrode | perfluorosulfonic acid (PFSA) ionomer interfaces in a solid state electrochemical cell reveals an increase in both the oxygen diffusion coefficient (Db) and oxygen permeability (Dbcb) upon consecutive potential step measurements. From a vapor-equilibrated, electrochemically unperturbed state under conditions of 70% RH and 50°C, Db and Dbcb increased by factors of 2 and 1.5, respectively. Db and Dbcb return to their initial values after resting the electrode at the open circuit potential. The electrochemical generation of water is believed responsible for the time-dependent mass transport parameters of ORR.
Publication date
PublisherThe Electrochemical Society
LanguageEnglish
AffiliationNational Research Council Canada; Energy, Mining and Environment
Peer reviewedYes
NPARC number21275753
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Record identifiera858165c-c3c7-4d3b-8e53-6360d6ece4f4
Record created2015-07-14
Record modified2016-05-09
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