Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 17, Issue 15, Pages 9802-9811Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5cp00376h
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Funding
- Automotive Partnership Canada grant
- Ballard Power Systems
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We present a physical-analytical model for the potential distribution at Pt nanodeposits in a polymer electrolyte membrane (PEM). Experimental studies have shown that solid deposits of Pt in PEM play a dual role in radical-initiated membrane degradation. Surface reactions at Pt particles could facilitate the formation as well as the scavenging of ionomer-attacking radical species. The net radical balance depends on local equilibrium conditions at Pt nanodeposits in the PEM, specifically, their equivalent local electrode potential. Our approach utilizes a continuum description of crossover fluxes of reactant gases, coupled with the kinetics of electrochemical surface reactions at Pt nanodeposits to calculate the potential distribution. The local potential is a function of the PEM structure and composition, which is determined by PEM thickness, concentrations of H-2 and O-2, as well as the size and density distribution of Pt particles. Model results compare well with experimental data for the potential distribution in PEMs.
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