(404a) In-Situ Electrochemical Techniques to Determine Ionomer Coverage in PEFC Electrodes
AIChE Annual Meeting
2019
2019 AIChE Annual Meeting
Transport and Energy Processes
Fuel Cells, Electrolyzers, and Electrochemical Devices
Tuesday, November 12, 2019 - 3:30pm to 3:45pm
Herein, the development and utilization of in situ electrochemical techniques designed to probe the local ionomer interactions will be utilized in conjunction with established testing protocols to relate ionomer coverage (on Pt and/or C support) with kinetic performance and O2 transport resistance of fully-conditioned PEFC electrodes. Specifically, CO displacement chronoamperometry and electrochemical impedance spectroscopy techniques will be described to determine local ionomer coverages across a series of Pt/C MEAs. These results will promote a deeper understanding of ionomer-catalyst interactions which in turn will inform future materials development and integration necessary to achieve high performance PGM (e.g. Pt/C and Pt alloy/C) electrocatalyst-based electrodes.
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