Abstract
Solid-gas and electrochemical hydrogenation properties of La2MgNi7Co2 alloy are presented. Hydrogen concentration of 1.90 wt% at hydrogen pressure of 10 bar has been reached. The influence of the fabrication technology of La2MgNi7Co2 alloy on electrochemical performance of the hydride electrode were studied and discussed. To evaluate electrochemical characteristics of La2MgNi7Co2 electrodes including discharge capacity, self-discharge and kinetic parameters the galvanostatic charge/discharge technique was used. The studied samples were a multiphase. The presence of Mg-enriched phases (La2MgOx, (La, Mg)Ni3 and LaMgNi4) raises hydrogen capacity and makes an electrode less susceptible for the self-discharge effect. On the other hand Mg-presence in MH electrodes lowers the hydrogen desorption rate. It was found that, the dominant abundance of the LaNi5 phase in the tested materials has a positive effect on the kinetic parameters of the hydride electrode.
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