Abstract
Based on the static equilibrium of electrochemical reaction kinetics, i.e. the same static reaction current density of forward and backward reactions, a relationship has been established between the equilibrium potential during discharge ( E e) and hydrogen concentration ( C H) in a hydride alloy (Mm 0.4Ml 0.6Ni 3.8Co 0.5Al 0.3Mn 0.4) at an equilibrium discharge condition. The theoretical results are in an agreement with the experimental electrochemical data in the two-phase (α-β) region of the hydrogen-absorbing alloy. The enthalpy (Δ H) and entropy (Δ S), which is a function of hydrogen concentration in the electrode alloy, were obtained by fitting the curve of the equilibrium potential vs hydrogen concentration.
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