Abstract:

The Ni-W-WC composite-coating electrode was prepared by electrolytic composite-deposition. The characterization for the hydrogen evolution reaction (HER) was compared in 7 mol• L -1 KOH solution by steady-state polarization and AC impedance technique. The results show that the composite-coating electrode is catalytically more active than Ni-W electrode. The electro- catalytic activities of the composite-coating electrode are attributed to the increase in the real surface areas and the decrease in the standard free energy of activation. The stability test of the composite-coating electrode shows excellent stability during long-term continuous electrolysis and good resistance against frequent power interruption on this electrode.

Key words: Composite electrode, Electroctalysis, Hydrogen evolution