Hydrogen evolution on Ni/WC composite coatings

Abstract

The catalytic activity for the hydrogen evolution reaction (HER) of Ni/WC composites obtained by electrochemical deposition of nickel from a conventional Watt's bath, using two different ways of depositing the WC particles, was investigated. All the composite coatings exhibited electrocatalytic activity for the HER larger than that of pure Ni in both alkaline and acid solution. The activity increased with increasing content of WC in the coating and, in the pulsed current regime, with increasing frequency of pulsation. In addition, coatings with smaller particles incorporated exhibited higher activity than those with larger particles. At a constant potential, an order of magnitude higher current densities were obtained in some cases.

Reversible Electrocatalytic Activity of Carbon‐Supported PtxNi1−x in Hydrogen Reactions

“…The present work focused on the role of Ni in the catalytic activity of Pt towards the HER and HOR. This cheap and abundant transition metal is thermodynamically stable in alkaline medium and can catalyze water reduction with high overpotentials . Carbon‐supported Pt x Ni 1− x electrode materials were prepared by the bromide anion exchange (BAE) method, which is a surfactant‐free, simple, chemical‐synthesis approach that avoids inhibition of catalytic sites by long‐chain organic compounds .…”

Electrocodeposition and Characterization of Ni-WC Composite Coating From Non − Aqueous Bath

“…On correlating the hardness value of composites from amount of WC incorporated in the deposits at various current densities, it is observed that hardness value increases with the WC in the deposits. A proportionately large increment beyond 3 Adm -2 could be the result of increased hydrogen adsorption due to presence of WC [39] in deposits and measured hydrogen in composite (17.74 ppm) strongly supports the trend. Microhardness values were also measured at 10 and 20 gL -1 of WC in the bath at constant current density of 3 A dm -2 .…”

Amorphous Nickel-Based Thin Film As a Janus Electrocatalyst for Water Splitting

“…Hence, it is of both scientific and commercial interests to develop alternative catalysts that are more abundant and economical. The alternative materials typically include Raney Ni and Ni alloys, − which are generally used as the HER catalysts in alkaline electrolytes. MoS 2 nanoparticles , and their analogues − have been suggested as promising HER catalysts, but they often operate in an acidic environment.…”