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http://dx.doi.org/10.7316/KHNES.2020.31.1.8

Intermittent Operation Induced Deactivation Mechanism for HER of Ni-Zn-Fe Electrode for Alkaline Electrolysis  

HAN, JIMIN (Korea Institute of Energy Research)
KIM, JONGWON (Korea Institute of Energy Research)
BAE, KIKWANG (Korea Institute of Energy Research)
PARK, CHUSIK (Korea Institute of Energy Research)
JEONG, SEONGUK (Korea Institute of Energy Research)
JUNG, KWANGJIN (Korea Institute of Energy Research)
KANG, KYOUNGSOO (Korea Institute of Energy Research)
KIM, YOUNGHO (Department of Chemical Engineering and Applied Chemistry, Chungnam National University)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.31, no.1, 2020 , pp. 8-22 More about this Journal
Abstract
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.
Keywords
Alkaline water electrolysis; Accelerated stress-test; Ni-Zn-Fe alloy; Deactivation;
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