Abstract
To investigate the water transport behavior in the cathode catalyst layer (CCL) of an operating proton exchange membrane fuel cell (PEMFC), we examined transversal liquid water distributions in the CCL by using high-resolution soft X-ray radiography. The liquid water concentration gradient across the CCL was observed at a spatial resolution of 1.5μm. More liquid water accumulated in the CCL at the gas diffusion layer side than at the polymer electrolyte membrane side. The effect of accumulated liquid water in the CCL on the charge-transfer resistance was confirmed by electrochemical impedance spectroscopy. Liquid water accumulation in the CCL corresponds to deterioration of charge-transfer in the electrode.
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