The hydrogen evolution reaction on codeposited Ni-hydrogen storage intermetallic particles in alkaline medium
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Data
2000-11-01
Autores
Bocutti, R.
Saeki, M. J.
Florentino, A. O.
Oliveira, CLF
Angelo, ACD
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Elsevier B.V.
Resumo
The hydrogen evolution reaction (HER) was studied on Ni-LaNi5 and Ni-MmNi(3.4)Co(0.8)Al(0.8) electrode materials in 1 mol dm(-3) NaOH solution. The steady-state polarization curves and electrochemical impedance spectroscopy experimental data showed a pronounced improvement in HER kinetics when these electrode materials were used. The electrochemical results are in accordance with the Volmer-Heyrovsky mechanism. The kinetic results indicate a more effective improvement in the Heyrovsky step, suggesting an electrocatalytic synergistic effect of the hyper-electronic character of the Ni and the hypo-electronic character of the rare-earth element on the electrode surface. (C) 2000 International Association for Hydrogen Energy. Published by Elsevier B.V. Ltd. All rights reserved.
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International Journal of Hydrogen Energy. Oxford: Pergamon-Elsevier B.V., v. 25, n. 11, p. 1051-1058, 2000.