Electrodeposited porous spherical Ni(OH)2@Ni on carbon paper for high-efficiency hydrogen evolution

Exploring noble-free electrocatalyst for hydrogen evolution by electrolysis of water is significant. Herein, porous Ni(OH)(2)@Ni spherical particles are electrodeposited on carbon papers as efficient electrocatalysts for hydrogen evolution reaction (HER) from water. Due to the porous and composite structure, the HER activity of Ni(OH)(2)@Ni/CP is better than the single phase Ni or Ni(OH)(2) particles on the carbon paper. The overpotential of Ni(OH)(2)@Ni/CP is 106 mV at the current density of 10 mA cm(-2) and the Tafel slope is 88 mV dec(-1). Moreover, the stability of the catalysts tested for 12 h is also good for HER. Furthermore, the small R-ct (1.65 Omega) of Ni(OH)(2)@Ni/CP provides the evident for its excellent catalytic performance. The method of electrodeposition provides the controllable uniform size for porous spherical Ni(OH)(2)@Ni particles. Moreover, the Faradaic efficiency for hydrogen evolution is 100%. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

Porous Ni(OH)(2)@Ni spherical particles were prepared as efficient electrocatalysts for hydrogen evolution, showing better performance compared to single-phase Ni or Ni(OH)(2) particles. The overpotential of the catalyst was 106 mV at a current density of 10 mA cm(-2), with a Tafel slope of 88 mV dec(-1). The catalyst also exhibited good stability and a Faradaic efficiency of 100%.