Abstract
In this paper the effect of concentration of KOH solution containing 0.02 M borohydride on the electrochemical properties of Ml(NiCoAl)5 hydrogen storage alloys, including the high rate dischargeability, exchange current density I0, limiting current density IL, and diffusion of hydrogen in the hydride, by means of linear polarization, anodic polarization, cathodic polarization, and electrochemical impedance spectroscopy, was studied in detail. The results show that high rate dischargeability, the exchange current density i0, and limiting current density IL increase, and the anodic and cathodic polarization decrease with the increase in concentration of KOH. The size of a semicircle of electrochemical impedance spectroscopy decreased with increase in concentration of KOH, which indicates that the diffusion coefficient of hydrogen increases. Within the range of the experimentation, it can be concluded that the higher the concentration of KOH, the better the electrochemical properties of Ml(NiCoAl)5 hydrogen storage alloys.
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