Resumo

MADRAMA, Ali R; ZONOUZ, Abolfazl F  e  POURETEDAL, Hamid R. Kinetic Investigation of Quaternary Ni-Fe-P-C Composite Coating as a New Catalyst for Hydrogen Evolution Reaction. Port. Electrochim. Acta [online]. 2015, vol.33, n.3, pp.153-163. ISSN 0872-1904.  https://doi.org/10.4152/pea.201503153.

A new quaternary Ni-Fe-P-C composite coating was deposited on copper substrates by an electrodeposition process. The morphology, structure and composition of the prepared electrode were characterized using scanning electron microscopy (SEM), X- ray diffraction (XRD) pattern, and energy dispersive X-ray spectroscopy (EDX). The activity of the composite coating toward hydrogen evolution reaction (HER) was evaluated on the basis of the steady-state polarization Tafel curves and electrochemical impedance spectroscopy (EIS) in 1 M NaOH at temperature of 298 K. The experimental results revealed that the HER activity of the Ni-Fe-P-C coatings was enhanced compared with both ternary coatings of Ni-P-C and Ni-Fe-C. The source of its activity was found from its high surface area and its intrinsic properties. It was sufficient to assume the Volmer-Heyrovsky mechanism with the Heyrovsky reaction as the rate- determining step to explain the experimental data. Besides the high electrocatalytic activity, excellent chemical and electrochemical stability were observed for Ni-Fe-P-C composite coating toward the HER in 1 M NaOH at 298 K.

Palavras-chave : hydrogen evolution reaction; quaternary Ni-Fe-P-C coatings; composite coatings; electrochemical activity; electrocatalyst.

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