The oxygen evolution reaction on passive oxide covered transition metal electrodes in alkaline solution. Part 2-Cobalt.
Item Type:Journal Article
Citation:M E G Lyons M P Brandon `The oxygen evolution reaction on passive oxide covered transition metal electrodes in alkaline solution. Part 2-Cobalt? in International Journal of Electrochemical Science, 3, (12), 2008, pp 1425 - 1462
Lyons Brandon IJES 2008 OER paper 2 3121425.pdf (published (publisher copy) peer-reviewed) 793.7Kb
Details are outlined of an electrochemical investigation of the oxygen evolution reaction (OER) at passive oxide covered polycrystalline Co electrodes in aqueous alkaline solution. Kinetic studies on electrodes subjected to different pre-treatment routines, yielded different values of the Tafel slope and the reaction order with respect to OH- activity. Only one mechanistic pathway could account for all observed values of these kinetic parameters. This pathway is similar, although not identical, to that proposed, in the first paper of this series, for the reaction at oxide covered Ni anodes. Using cyclic voltammetry it was shown that the mechanism for the initial passivation of Co electrodes varies with OH- concentration. This in turn can have an effect on the experimental value of the OER Tafel slope, a phenomenon which can be rationalized in terms of a dual energy barrier model.
Irish Research Council for Science Engineering and Technology
Higher Education Authority
Author: LYONS, MICHAEL EDWARD
Publisher:Electrochemical Science Group
Type of material:Journal Article
Series/Report no:International Journal of Electrochemical Science
Availability:Full text available