Impedance study of hydrogen evolution on Ni/Zn and Ni–Co/Zn stainless steel based electrodeposits |
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Authors: | I. Herraiz-Cardona,E. Ortega,V. Pé rez-Herranz |
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Affiliation: | IEC Group, Departamento de Ingeniería Química y Nuclear, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022 Valencia, Spain |
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Abstract: | A study on the electrocatalytic performance of Ni/Zn and Ni–Co/Zn alloys for hydrogen evolution reaction (HER) in alkaline media (30 wt.% KOH solution) has been carried out. After preparing by electrodeposition on stainless steel supports, the alloys were leached of to remove part of the zinc and generate a porous layer. For the developed electrodes, the surface roughness factor, Rf, was evaluated by electrochemical impedance spectroscopy (EIS). The HER on these electrodes was evaluated by means of steady-state polarization curves and EIS. The obtained electrodes were characterized by large Rf for HER, and very low overpotentials at the current density of 250 mA cm−2, η250 ∼ 0.138 V at 30 °C. The high electrode activity was mainly attributed to the high surface area of the developed electrodes. |
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Keywords: | Electrochemical impedance spectroscopy Hydrogen evolution reaction Surface roughness factor Nickel&ndash cobalt/zinc alloys |
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