PEFCs are promising alternative power sources for various processes, but the degradation of cathode electrocatalysts is still serious for automobiles. The oxidation, dissolution, and degradation of cathode electrocatalysts proceed in whole areas of a heterogeneous membrane electrode assembly of PEFC, and their degradation processes under working conditions are not clear yet.<br/>We have developed Operando X-ray XAFS imaging methods of electrocatalysts in PEFCs under working conditions. Computed tomography XAFS of high-flux hard X-rays is developed for three-dimensional XAFS imaging and we succeeded in visualizing the distribution of electrocatalysts and chemical states in MEAs under PEFC cell-voltage operating conditions. Recent progress of XAFS imaging will be presented.

Operando imaging of PEFC electrocatalysts by time/space-resolved XAFS

251st National Meeting (2016)

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