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Regarding a polymer electrolyte fuel cell (PEFC), the influence of degradations of a catalyst layer and a gas diffusion layer which are parts of membrane electrode assembly (MEA) on electrode flooding was investigated. On a PEFC, high humidity operation is desired for high performance because it is necessary to contain much water in proton exchange membrane and ionomer at catalyst layer. Additionally, high gas utilization is required for high system efficiency. However, under these conditions, significant degradation in a cell performance is caused by water-flooding of electrodes. The purpose of this study is to investigate how the degradation of a catalyst layer and a gas diffusion layer give the influence to occur flooding on electrode. The single cell was generated at 0.3A/cm2 under high humidity operation for 10000 hours. And the cell performance was evaluated as cell voltage, cell resistance, IV curves, gas crossover rate, electrochemical surface area and Oxygen gain in order to find which part of the cell dominates such cell degradation. Consequently, it is found that the gas diffusivity degradation finally dominates the decay of the cell performance and it is mainly caused not in the gas diffusion layer but in the catalyst layer.

Influence of Degradations of Catalyst Layer and Gas Diffusion Layer on Flooding in PEFC