The stability of hydrogen evolution activity and corrosion behavior of NiCu coatings with long-term electrolysis in alkaline solution

Solmaz R., Doner A., Kardas G.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, vol.34, no.5, pp.2089-2094, 2009 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 34 Issue: 5
  • Publication Date: 2009
  • Doi Number: 10.1016/j.ijhydene.2009.01.007
  • Journal Name: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.2089-2094
  • Keywords: NiCu coatings, Electrochemical deposition, Electrolysis, Corrosion, Electrocatalysis, Hydrogen evolution reaction, ELECTROCATALYTIC PROPERTIES, MILD-STEEL, ALLOY, ELECTRODES, ENERGY, ADSORPTION, IMPEDANCE, KINETICS, ACID, FUEL
  • Çukurova University Affiliated: Yes

Abstract

In this study, NiCu composite coating was electrochemically deposited on a copper electrode (Cu/NiCu) and tested for hydrogen evolution reaction (HER) in 1 M KOH solution for long-term electrolysis with the help of cathodic current-potential curves and electrochemical impedance spectroscopy (EIS) techniques. The bulk and surface composition of the coating was determined using atomic absorption spectroscopy (AAS) and energy dispersive X-ray (EDX) analysis. The surface morphology was investigated by scanning electron microscopy (SEM). The effect of electrolysis on the corrosion behavior of the Cu/NiCu electrode was also reported. It was found that the NiCu coating had a compact and porous structure with good time stability. The HER activity of the coating was stable over 120 h electrolysis and the HER mechanism was not modified during the operation. The corrosion tests showed that the corrosion resistance of the Cu/NiCu electrode changed when a cathodic current was applied to the electrolysis system. (C) 2009 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.