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In this study, we investigated the deactivation characteristics of
Ni-Zn-Fe electrodes due to intermittent operation in alkaline water electrolysis.
To find suitable method to accelerate deactivation of electrode, the accelerated
stress-test (AST) which repeated on/off step was performed with constant current/voltage control. The AST under constant voltage control is suitable to deactivate electrode so it were selected to investigate deactivation of electrode. The
AST which repeated on/off step in range of –1.3 V and 0 V was performed and the
relationship between oxidation current and electrode deactivation in the off step
was investigate. As results, it was confirmed that the nickel and zinc on electrode
surface were oxidized due to anodic current which occurred at off step.
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