Abstract
Performance at high current density is dominated by transport losses from resistance to oxygen and proton transport. The materials selection and their properties can have a significant impact on the transport resistance. In this study, the impact of catalyst carbon support microstructure and its properties impacting performance at high current density is studied in detail. Platinum-cobalt alloy catalysts supported on different carbon supports were analyzed for pore size distribution characteristics. Catalyst layer electrochemical diagnostics such as oxygen limiting current and H2/N2 impedance tests were conducted to measure local oxygen transport resistance and bulk proton transport resistance. For the first time, the local-oxygen transport and the bulk-proton transport resistances in the catalyst layer are directly correlated to the micropore and macropore properties of the carbon support.
Published Version
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