Journal
ELECTROCHIMICA ACTA
Volume 159, Issue -, Pages 210-218Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.01.110
Keywords
Hydrogen Evolution; Nickel; Rotating Disk Electrode; Electrochemical Impedance; Ageing
Categories
Funding
- Agencia Nacional de Promocion Cientifica y Tecnologica
- CONICET [PIP 00095]
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Nickel catalysts were characterized for the hydrogen evolution reaction (HER) using rotating disk electrode (RDE) and electrochemical impedance spectroscopy (EIS). The theoretical Levich slope was calculated on the basis of the HER mechanism in alkaline solution. Kinetic and thermodynamic parameters of the reaction were obtained for fresh polished nickel electrode (Ni-f), and for nickel after a quick chronoamperometric aging procedure (Ni-pc). Koutecky-Levich analysis indicated that the rate determining step on Nif is the one-electron Volmer reaction, while for Ni-pc decreases from one to 0.68 and exhibits a strong temperature dependence. A loss of catalytic activity, corresponding to an increase of 0.3 V of the HER onset potential, was observed after aging. Furthermore, from the EIS-Tafel analysis we concluded that the H adsorption changes from a Langmuir type for Ni-f, to a Temkin type for Nipc. (C) 2015 Elsevier Ltd. All rights reserved.
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