Abstract
A.c. impedance, cyclic voltammetry and linear polarization techniques were applied to the electrochemical characterization of LaNi 5 single crystalline and polycrystalline smooth electrodes in 6 M KOH solution. The single crystalline electrode was found to have a lower charge-transfer resistance and higher electrocatalytic surface activity along the [001] direction compared with the polycrystalline electrode. The total impedance of the hydriding reaction is much less for the single crystalline alloy than for the polycrystalline alloy. The mechanism of electrode hydriding reaction is related to the crystalline structure and orientation.
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