Kinetics of hydrogen evolution reaction in alkaline electrolysis on a Ni cathode in the presence of Ni-Co-Mo based ionic activators
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АуториNikolić, Vladimir M.
Maslovara, Slađana Lj.
Tasić, Gvozden S.
Marčeta Kaninski, Milica
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This paper presents investigations on the influence of in-situ ionic activation using combination of three D-metals: Ni, Co and Moon the hydrogen evolution reaction (HER) mechanism and kinetics. Polarization measurements were performed to obtain kinetic parameters for the HER and the results are presented to show Tafel slopes, exchange current densities and apparent energy of activation. The values of the kinetic parameters confirm the existence of two Tafel slopes, in the case of NiCoMo based ionic activators (i.a.) in the investigated temperature range, with very high values of the exchange current density. Electrochemical impedance spectroscopy measurements were employed to further investigate the origin of the obtained electrocatalytic effect on the HER. The measurements were performed at several overpotentials and temperatures. It was found that co-deposition of Ni, Co and Mo species on the Ni cathode results in a large number of active sites for hydrogen adsorption, and a synerge...tic effect giving electronic structure suitable for the HER, are the main factors contributing to the enhanced HER kinetics. It was shown that EIS measurements had a crucial role in determining the HER mechanism, especially with the complex in-situ activation of the alkaline electrolysis. (C) 2015 Published by Elsevier B.V.
Кључне речи:Hydrogen evolution reactionl / In-situ activation / Ionic activator / Alkaline electrolyzer
Извор:Applied Catalysis. B: Environmental, 2015, 179, 88-94
- Водонична енергија - развој нових материјала: електролитичко добијање водоника, водоничне горивне ћелије, изотопски ефекти (RS-172045)
ISSN: 0926-3373 (print); 1873-3883 (electronic)