Abstract
The hydrogen evolution reaction (HER) at a Pd–Ni electrodeposited alloy electrode has been studied by means of ac impedance spectrum measurements and by dc polarization current behavior in 0.5 mol dm −3 NaOH solution at 25°C. The rate constants of the forward and backward reactions of the corresponding steps were estimated by a nonlinear fitting method. It has been found that the overall reaction proceeds through a Volmer–Heyrovsky mechanism, with Heyrovsky as the rate determining step. The coverage vs potential relation is discussed comparing the results of ac impedance calculations with the same of potential decay determinations.
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