Abstract
The deterioration of the solid polymer electrolyte membrane employed for the polymer electrolyte fuel cells (PEFCs) during the operations is the urgent problem to be solved for the practical use of PEFCs. In the present study, to investigate the deterioration mechanisms, the morphological change of the membrane which was deteriorated chemically in Fenton media was studied by observing the spectral change of the confined water molecules in the membrane by ¹H NMR spectroscopy. For untreated membranes, the polymer structure is thermally converted at around 358 K, so that the mobility of water became higher and the chemical environments became more homogeneous. However, it was revealed that the deteriorated membrane could not take such a specific structure that enables the higher conductivity of the membrane.

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