Preparation, characterization and application of alkaline leached CuNiZn ternary coatings for long-term electrolysis in alkaline solution


Solmaz R., Doner A., KARDAŞ G.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, cilt.35, ss.10045-10049, 2010 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 35 Konu: 19
  • Basım Tarihi: 2010
  • Doi Numarası: 10.1016/j.ijhydene.2010.07.145
  • Dergi Adı: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
  • Sayfa Sayısı: ss.10045-10049

Özet

The NiCuZn ternary coating was electrochemically deposited on a copper electrode. Then, it was etched in a concentrated alkaline solution (30% NaOH) to produce a porous and electrocatalytic surface suitable for use in the hydrogen evolution reaction (HER). The surface composition of coating before and after alkaline leaching was determined by energy dispersive X-ray (EDX) analysis. The surface morphologies were investigated by scanning electron microscopy (SEM). The long-term stability of electrode prepared for alkaline water electrolysis was investigated in 1 M KOH solution with the help of cathodic current-potential curves and electrochemical impedance spectroscopy (EIS) techniques. It was found that, the NiCuZn coating has a compact and porous structure with good physical stability. Alkaline leaching process further improved the activity of NiCuZn coating in comparison with binary NiCu deposit for the HER. The long-term operation at -100 mA cm(-2) showed good electrochemical stability over 120 h. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.