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Three Dimensional Analyses of Degradation in PEMFCs

Proton exchange membrane fuel cell (PEMFC) is one of the candidate materials which can utilize the hydrogen without emitting greenhouse effect gas. However, the lifetime of PEMFCs is still short due to the degradation phenomena during operation. Previous studies suggest that applied temperature leads aggregation of supported particles and changes the distribution of metal nanoparticles and ionomers on carbon blacks. Recently, nanoscale distribution of these nanoparticles and ionomers attracts much attention to clarify these degradation mechanisms of PEMFCs and to improve the performance. Recent studies of distribution of the nanoparticles and ionomers of PEMFCs were investigated by tomography [1] and in-situ observation [2].