Transient Current Distributions in Porous Zinc Electrodes in  KOH  Electrolyte

Transient current distributions were measured in porous Zn electrodes at current densities from 24 to 240 mA/cm exp 2 in 7.24N KOH saturated with ZnO. The current distributions were highly nonuniform. The reaction penetration depth was initially approx 0.015 cm and decreased gradually to approx 0.00...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 1982-02, Vol.129 (2), p.239-246
Main Authors: Liu, Ming‐Biann, Cook, G. M., Yao, N. P.
Format: Article
Language:English
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Summary:Transient current distributions were measured in porous Zn electrodes at current densities from 24 to 240 mA/cm exp 2 in 7.24N KOH saturated with ZnO. The current distributions were highly nonuniform. The reaction penetration depth was initially approx 0.015 cm and decreased gradually to approx 0.008 cm at "steady state". The current distribution change occurring during passivation of the electrode was measured. The analysis of the experimental data indicates that the high nonuniformity of current distributions was due to high electrolyte resistance compared with both the charge-transfer resistance and the diffusion resistance of OH exp -- ions. A model incorporating a surface blockage mechanism by compact ZnO formation did not completely predict the observed passivation behavior of the electrode. 35 ref.--AA
ISSN:0013-4651
1945-7111
DOI:10.1149/1.2123802