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

Solmaz, Ramazan; Doner, All; KARDAŞ, GÜLFEZA

doi:10.1016/j.ijhydene.2010.07.145

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

Copy For Citation

Solmaz R., Doner A., KARDAŞ G.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, vol.35, no.19, pp.10045-10049, 2010 (SCI-Expanded)

Publication Type: Article / Article
Volume: 35 Issue: 19
Publication Date: 2010
Doi Number: 10.1016/j.ijhydene.2010.07.145
Journal Name: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
Page Numbers: pp.10045-10049
Keywords: NiCuZn coatings, Electrochemical deposition, Energy dispersive X-ray analysis, Electrolysis, Electrocatalysis, Hydrogen evolution reaction, HYDROGEN EVOLUTION REACTION, ELECTROCATALYTIC PROPERTIES, ELECTROCHEMICAL DEPOSITION, AMORPHOUS-ALLOYS, NICU COATINGS, WATER, ENERGY, ELECTRODES, BEHAVIOR, KINETICS
Çukurova University Affiliated: Yes

Abstract

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.