Abstract
A detailed analysis was made of the relation between the degradation behavior of a membrane electrode assembly (MEA) and deposited Pt (Pt band) in the membrane during an open circuit voltage (OCV) hold test. Molecular-structural changes in the membrane were investigated by micro-Raman spectroscopy. When the Pt band was not significantly observed in the membrane after the test, the membrane was relatively stable. In contrast, when the Pt band was clearly formed, the membrane around it was intensively degraded. The magnitude of the fluoride ion emission rate (FER) of the effluent water from the anode and the cathode was also consistent with the location of the Pt band. It was verified that the Pt band is one of the factors accelerating membrane degradation.
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