Abstract
Horizontal upward-facing zinc anode surfaces combined with Ni(OH)2/NiOOH cathodes in 1.95 M KOH aqueous solution were electrochemically dissolved and deposited with pulsed current. The morphological variations of zinc oxide were examined as a function of pulse width at three different locations on the anode surface using ex situ SEM observation. The particle size of zinc oxide varied with pulsed current for different pulse periods. Then, the transient variations in electrolyte for refractive index profiles along the axis perpendicular to the zinc anode were in situ measured under pulsed current using holographic interferometry. The oscillating layers of the refractive index profile were observed and related to a duplex diffusion layer model proposed by Ibl. Much more fine set up of SOC can be anticipated by combining the present results with HEV control (ECU) system.
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