Study of RuO sub(2) as an electrocatalyst for hydrogen evolution in alkaline solution

The hydrogen evolution reaction (HER) on RuO sub(2) coated nickel electrodes was investigated by d.c. polarization studies and a.c. impedance measurements in alkaline solution. The electroactive RuO sub(2) coatings were prepared by thermal decomposition of a RuCl sub(3) solution at 450 degree C in a...

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Bibliographic Details
Published in:Journal of applied electrochemistry 1996-01, Vol.26 (4), p.397-402
Main Authors: Spataru, N, Le Helloco, J-G, Durand, R
Format: Article
Language:English
Online Access:Get full text
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Summary:The hydrogen evolution reaction (HER) on RuO sub(2) coated nickel electrodes was investigated by d.c. polarization studies and a.c. impedance measurements in alkaline solution. The electroactive RuO sub(2) coatings were prepared by thermal decomposition of a RuCl sub(3) solution at 450 degree C in air. The real surface area of the cathodes was estimated from cyclic voltammetric measurements and from the double layer capacitance (evaluated by impedance measurements). A mechanism for the HER has been proposed involving two steps (Volmer and Heyrovsky reactions). The rate constants of the forward and backward reactions of these two steps have been estimated by a nonlinear fitting procedure.
ISSN:0021-891X