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, cilt.34, ss.2089-2094, 2009 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 34 Konu: 5
  • Basım Tarihi: 2009
  • Doi Numarası: 10.1016/j.ijhydene.2009.01.007
  • Dergi Adı: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
  • Sayfa Sayısı: ss.2089-2094

Özet

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.