Abstract
The effects of the addition of cobalt powder, nickel powder and graphite to metal hydride (MH) electrode have been investigated using the constant current charge/discharge test. Electrochemical impedance spectroscopy, linear polarization and cyclic voltammetry methods were used to study the mechanism for the property variation. Cobalt powder addition can increase the MH electrode capacity at lower charge/discharge rates, but decrease the capacity at higher charge/discharge rates. Nickel powder addition is beneficial to the capacity and rate-dischargeability due to the improvement of electrical conductance and electrocatalytic activity of the MH electrode. The performance of the MH electrode is slightly improved with the addition of graphite. The lower-frequency semicircle observed in the Nyquist plot is suggested to be the reaction impedance of the MH electrode.
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