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• W1596402511 abstract "Abstract A technique is described for determining the source and degree of electrodes degradation in membrane electrode assemblies (MEAs) from proton exchange membrane fuel cells. This technique is nondestructive and provides spatial resolution across the MEA's active area. The degradation modes that are considered are the oxygen reduction activity loss through either electrochemically active area or mass activity loss, increased gas transport resistance from corrosion of the catalyst's carbon support, and the increased protonic transport loss through chemical degradation of the electrode layer's ion‐conducting polymer. A current distribution tool is used with cyclic voltammetry and polarization curves to isolate each of the primary sources of voltage degradation. Results of new MEAs are presented first to demonstrate the approximate resolution of the test method. Then results are presented for MEAs that were aged in a model test to cause carbon corrosion in the cathode layer via localized anode starvation. These include follow‐up materials characterization, where it is shown that the results of this electrochemical diagnostic correlate well with postmortem materials characterization. Finally, results are shown for a part aged in a model start‐up/shutdown aging test and compared with modeling results to explain the spatial characteristics of the observed degradation." @default.
• W1596402511 created "2016-06-24" @default.
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• W1596402511 date "2010-12-15" @default.
• W1596402511 modified "2023-10-16" @default.
• W1596402511 title "Electrode degradation mechanisms studies by current distribution measurements" @default.
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• W1596402511 doi "https://doi.org/10.1002/9780470974001.f500055" @default.
• W1596402511 hasPublicationYear "2010" @default.
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