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Electrochimica ActaVolume 42, Issue 2, 1997, Pages 323-330

The determination of kinetics parameters of the hydrogen evolution on Ti-Ni alloys by ac impedance(Article)

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  • aFaculty of Technology and Metallurgy, University of Belgrade, Belgrade, Serbia, Yugoslavia
  • bFaculty of Mechanical Engineering, University of Belgrade, Belgrade, Serbia, Yugoslavia
  • cFaculty of Agriculture, University of Belgrade, Belgrade-Zemun, Serbia, Yugoslavia

Abstract

The kinetics and mechanism of hydrogen evolution at Ti-Ni alloys electrode has been studied by means of steady-state potentiostatic polarization and ac impedance spectrum measurements. Complex-plane spectrum plots are derived for the h.e.r. at one of the most inactive, typical hydridic, Ti-Ni, and one of the most active, typical electrocatalytic, Ti-Ni3, intermetallic alloy compounds at various potentials. 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 coupled Volmer-Heyrovsky mechanism. The electrocatalytic activity decreases in the order TiNi2 > TiNi3 > TiNi4 > Ti2Ni > TiNi > Ti3Ni > TiNi0.7. Copyright © 1996 Elsevier Science Ltd.

Author keywords

ac impedanceElectrocatalytic activityHydrogen evolutionKinetic parametersTiNi alloys

Indexed keywords

Engineering controlled terms:CatalysisElectrochemical electrodesElectrochemistryIntermetallicsPolarizationReaction kineticsTitanium alloys
Engineering uncontrolled terms:AC impedanceElectrocatalysisHydrogen evolution
Engineering main heading:Nickel alloys
  • ISSN: 00134686
  • CODEN: ELCAA
  • Source Type: Journal
  • Original language: English
  • DOI: 10.1016/0013-4686(96)00188-0
  • Document Type: Article
  • Publisher: Elsevier Ltd

  Krstajić, N.V.; Faculty of Technology and Metallurgy, University of Belgrade, Yugoslavia
© Copyright 2022 Elsevier B.V., All rights reserved.

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