Comptes Rendus Chimie · 2014 · 11 citations · 37 references
Natural SciencesChemical EngineeringMaterials ScienceCatalysisElectrochemical EngineeringElectrochemistryCathode MaterialsElectrochemical CellsElectrochemical Energy ConversionElectrode KineticsElectrode MaterialsElectrode-electrolyte InterfacesCathode ProcessesDegradationElectrocatalystsElectrode DegradationElectrode Degradation MechanismsMembrane Electrode AssembliesMembrane Electrodes
Single-cell and half-cell degradation test procedures were evaluated for carbon-supported Pt/C, PtCo/C and PtNi/C catalysts. Half-cell analyses were employed to understand the effect of the number of cycles and of the scan rate over the cathode catalysts degradation under potential cycling from 0.6 to 1.2 V. The data suggested a time-dependent degradation for all three catalytic systems. Single-cell measurements were used to evaluate the impact of catalyst degradation on fuel cell performance. The measurements in both setups showed similar ECSA and ORR mass activity losses. Specific degradation mechanisms related to Pt dissolution, Pt agglomeration, and transitional metal leaching were quantified and correlated with performance losses.
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