NiS₂‑Coated\nCarbon Fiber Paper Decorated\nwith MoS₂ Nanosheets for Hydrogen Evolution

Abstract

It is of great significance to develop highly conductive\ncatalysts\ncombined with bimetal sulfide hybrids for the hydrogen evolution reaction\n(HER). Herein, an efficient electrocatalyst with NiS₂@MoS₂ nanosheet arrays decorating carbon fiber paper (NiS₂@MoS₂/CFP nanocatalyst) is synthesized through a two-step\nsolvothermal process. Carbon fiber paper provides great electrical\nconductivity and stability for NiS₂@MoS₂/CFP.\nMoreover, MoS₂ nanosheets are covered on the surface of\nthe NiS₂ nanosheet via a simple two-step temperature control\nmethod in a solvothermal process. The growth of two-dimensional NiS₂ nanosheets improves the loading area of MoS₂,\nthus providing plenty of electroactive sites. The obtained NiS₂@MoS₂/CFP delivers a competitive overpotential\nof 95 mV at the benchmark current density of 10 mA cm^–2 and achieves a small Tafel slope of 65 mV dec^–1, indicating the great HER performance of the NiS₂@MoS₂/CFP nanocatalyst. Moreover, NiS₂@MoS₂/CFP shows robust stability after 24 h of continuous operation toward\nthe HER in an acidic solution. This work provides a method to design\nhigh-efficient HER electrocatalysts through combining bimetal sulfide\nhybrids with a conductive substrate.