International Journal of Hydrogen Energy, Vol.43, No.33, 16061-16067, 2018
In-situ synthesis of carbon-coated beta-NiS nanocrystals for hydrogen evolution reaction in both acidic and alkaline solution
The electrocatalytic hydrogen evolution reaction (HER) performance of carbon-coated beta-NiS (NiS@C) nanocrystals has been investigated for the first time. The NiS@C nanocrystals were synthesized via a facile solvothermal method followed by in-situ carbonization process with the solvent (ethylene glycol) as the carbon source. Benefited from the well-dispersed NiS nanocrystals and the formation of carbon layer on NiS nanocrystals, the NiS@C nanocrystals displayed a high HER activity in 0.5 M H2SO4, which needed an over-potential of 85 mV to achieve current density of 10 mA cm(-1) with a Tafel slope of 46 mV dec(-1), as well as long term stability for HER. Additionally, the NiS@C nanocrystals also showed efficient electrocatalytic activity under alkaline media. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.