The mechanism of hydrogen evolution reaction on a modified Raney nickel composite-coated electrode by AC impedance

Journal Article · Thu Dec 31 23:00:00 EST 1992 · Journal of the Electrochemical Society; (United States)

DOI:https://doi.org/10.1149/1.2056073· OSTI ID:6485637

Okido, M; Depo, J K; Capuano, G A ^[1]

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1. Univ. du Quebec a Montreal (Canada)

The hydrogen evolution reaction (HER) on a modified Raney nickel electrode, consisting of Ni-Al-Cu-Cr alloy, was investigated with ac impedance measurements and by dc polarization current behavior in 5.36 M KOH solution at 70 C. Comparative measurements also were carried out on commercial Raney nickel (Ni-Al). The rate constants of the forward and backward reactions of Volmer, Heyrovsky, and Tafel steps were estimated by a nonlinear fitting method. The modified Raney nickel composite-coated electrode provides a lower overpotential for the HER than the commercial Raney nickel-coated electrode. The main pathway for the HER is Volmer-Tafel with Volmer as the rate determining step.

• OSTI ID: 6485637
• Journal Information: Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 140:1; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
080101* -- Hydrogen-- Production-- Electrolysis
ALKALI METAL COMPOUNDS
ALLOYS
ALUMINIUM ALLOYS
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
CHEMISTRY
CHROMIUM ALLOYS
COPPER ALLOYS
ELECTROCHEMISTRY
ELECTRODES
ELECTROLYSIS
ELEMENTS
HYDROGEN COMPOUNDS
HYDROGEN PRODUCTION
HYDROXIDES
KINETICS
LYSIS
METALS
NICKEL
NICKEL ALLOYS
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
POTASSIUM HYDROXIDES
REACTION KINETICS
TRANSITION ELEMENTS