In situ grown NiS nanorod/O-MoS nanosheet nanocomposite on carbon cloth as a free binder supercapacitor electrode and hydrogen evolution catalyst.

Transition metal sulfide nanostructure composites have received significant attention as energy conversion and storage devices. In this work, we report a three-dimension (3D) nanostructure with the NiS nanorods embedded in oxygen-incorporated MoS (O-MoS) nanosheets for supercapacitors and hydrogen evolution catalysts. The in situ grown NiS/O-MoS nanocomposite on carbon cloth can be used as a free binder supercapacitor electrode and hydrogen evolution catalyst. The NiS/O-MoS nanocomposite exhibits electrochemical behaviors with a specific capacitance of 907 F g (at 2 A g) and good cycle stability after 1200 cycles due to its unique mutual embedding 3D nanostructure. Furthermore, the NiS/O-MoS nanocomposite also shows highly electrocatalytic features for hydrogen production with an onset overpotential of ∼150 mV and a low Tafel slope of ∼81 mV dec. The oxygen incorporation of MoS provides more active sites to participate in the catalytic process for the hydrogen evolution reaction.