Abstract
Hydrogen oxidation currents at a electrode were measured directly at constant potentials for various hydrogen pressures and states of charge. It was found that the hydrogen oxidation current is linearly proportional to the hydrogen pressure at all electrode potentials and that the logarithm of the anodic current is a linear function of electrode potential. It was also found that hydrogen oxidation on the nickel substrate material was strongly inhibited by the presence of nickel hydroxide on the substrate surface. By comparing the currents for hydrogen oxidation and oxygen evolution on the electrode and on a nickel substrate, it is suggested that the self‐discharge of the electrode is mainly due to electrochemical oxidation of hydrogen on the active electrode material.
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