A novel structure of Ni-(MoS2/GO) composite coatings deposited on Ni foam under supergravity field as efficient hydrogen evolution reaction catalysts in alkaline solution

Abstract

We report a novel and simple approach to synthesis highly efficient and stable electrochemical catalyst of Ni-(MoS2/GO) composite coatings by electrodeposition from aqueous solution with the nickel sulphamate precursor. Depositing under supergravity fields has been applied to scatter more MoS2/GO hybrids in the coatings and decrease the size of nickel particles as far as possible and increase large amount of exposed active sites. In 1.0M NaOH solution, Ni-(MoS2/GO) only needs overpotentials as low as −33mV and −132mV at a current density of −10mAcm−2 and −100mAcm−2, respectively. The behavior of Ni-(MoS2/GO) exceeds most of the same reported HER catalysts in previously literature. In addition, we also synthesized Ni-MoS2, Ni-GO and pure Ni catalysts use the same method. The results show that Ni-(MoS2/GO) exhibited better HER activity at a current density of −100mAcm−2 than these catalysts. In the future research field of HER catalysis materials, the development of this material may be not limited to nickel based materials, also will be used in Fe, Co and other non noble metal based materials, outlining a general approach for the synthesis of nanostructured M-(MoS2/GO) as a class of new catalyst with efficient HER activity.