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An ac impedance method was applied to analyze the electrode behavior of hydrogen reduction in a LiCl-KCl eutectic melt containing LiH. Impedance plots of the Co and Cu electrodes were explained by using the Randles-Ershler equivalent circuit. Whereas the impedance plots of Fe and Ni electrodes showed an extraordinary shape due to the effect of the diffusion in the finite-length region and were successfully analyzed using a modified Randles-Ershler equivalent circuit, which took into account the effect of the diffusion of hydrogen atoms in the electrode. This analysis has revealed that both the semi-infinite diffusion of molecular hydrogen in electrolyte and the finite-length diffusion of hydrogen atoms in the electrode are contributing to the reaction at the interface of the electrode.
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Ito et al. (2001) studied this question.
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