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The low-cost and energy-efficient catalysts for water splitting are crucial for the sustainable development and renewable energy. The abundant reserves of nickel sulfides have been expected to serve as the precious metal-free materials for the oxygen evolution reaction (OER) or hydrogen evolution reaction (HER). In this research, a bi-functional S-doped Ni films on three-dimensional (3D) porous copper foams (marked as NiSx/CF) were prepared by a one-step potentiostatic electrodeposition approach in an ethaline solution containing 40mmol NiCl2·6H2O and 20mmol CH4N2S. The phase structures, surface elemental valence state,and surface microstructures were observed by X-ray diffraction (XRD), X-ray photoelectron spectrum (XPS),and field-emission scanning electron microscope (FE-SEM). The electrocatalytic performances were measured by linear sweep voltammetry (LSV), Cyclic Voltammetry (CV), Electrochemical impedance spectra (EIS) and ISTEP Multi-Current Steps. The doping of S into Ni grains and three-dimensional porous structure were found to induce more abundant active sites, significantly improving the water splitting electrolytic activity in alkaline media The NiSx/CF catalyst exhibits the lowest overpotential of OER with 302mV at 20 mA·cm and the lowest overpotential of HER with 146mV at 10 mA·cm. When used in electrocatalytic water splitting, it displays a low cell voltage usage of 1.532V at 20mA cm in 1 M KOH. Furthermore, it maintained excellent stability under multiple potentials. Therefore, this research offers a simple synthesis route to fabricate precious metalfree OER and HER Bi-functional catalysts for electrocatalytic water splitting.

international journal of electrochemical science

Bi-functional S-Doped Ni Catalysts on Copper Foams with Enhanced Electrocatalytic Performance and Excellent Stability for Electrocatalytic Water Splitting