Potentiostatic electrodeposition of self-supported Ni-S electrocatalyst supported on Ni foam for efficient hydrogen evolution

The commercial production of H-2 from water splitting requires highly efficient, low-cost, and stable earth-abundant electrocatalysts to speed up the kinetics of hydrogen evolution reaction (HER). In this study, we proposed a concise and effective strategy for fabricating Ni-S electrocatalysts on Ni foam (NF) substrate to serve as HER electrocatalysts during potentiostatic electrodeposition. The Ni-S electrocatalyst shows a cauliflower-like surface morphology when the electrodeposition voltage is adjusted. The proposed electrocatalyst exhibits excellent HER performance with a low overpotential of 58 mV at 10 mA.cm(-2) and a small Tafel slope of 81.6 mV.dec(-1) in 1.0 M KOH solution. Such a high performance can be attributed to the amorphous phase structures, high conductivity, composition optimization, and the close combination between the electrocatalyst and NF. This study provides a facile, fast, and feasible avenue for developing highly efficient and affordable electrochemical catalysts for HER. (C) 2020 The Author(s). Published by Elsevier Ltd.