Abstract
Transient current distributions were measured in porous zinc electrodes at current densities from 24 to 240 mA/cm2 in saturated with . The current distributions were highly nonuniform. The reaction penetration depth was initially about 0.015 cm and decreased gradually to about 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− ions. A model incorporating a surface blockage mechanism by compact formation did not completely predict the observed passivation behavior of the electrode. It was suggested that the passivation of the electrode may have been caused by pore plugging due to catalytic evolution of hydrogen.
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