Abstract
A fourfold-segmented PEMFC with four reference electrodes was created to measure current distribution, local polarization of the anode and cathode, and local impedance. When sufficient amounts of fully humidified gases were fed to the anode and cathode, cathode flooding was observed. When the feeding of the anode gas was reduced, reaction downstream of the anode was hindered, which seemed to be caused by anode flooding, instead of starvation due to consumption of the gas.
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