Defect-Rich Heterogeneous MoS2/rGO/NiS Nanocomposite for Efficient pH-Universal Hydrogen Evolution

Molybdenum disulfide (MoS2) has been universally demonstrated to be an effective electrocatalytic catalyst for hydrogen evolution reaction (HER). However, the low conductivity, few active sites and poor stability of MoS2-based electrocatalysts hinder its performance in a wide pH range. The introduction other metal phases carbon materials can create rich interfaces defects enhance activity catalyst. Herein, new defect-rich heterogeneous ternary nanocomposite consisted MoS2, NiS reduced graphene oxide (rGO) are synthesized using ultrathin ?Ni(OH)2 nanowires as nickel source. MoS2/rGO/NiS-5 optimal formulation 0.5 M H2SO4, 1.0 KOH PBS only requires 152, 169 209 mV overpotential achieve current density 10 mA cm?2 (denoted ?10), respectively. excellent HER electrocatalyst ascribed synergistic effect abundant MoS2/rGO/NiS, expanded interlayer spacings, addition high conductivity oxide. method reported here provide idea with Ni-Mo heterojunction, pH-universal inexpensive electrocatalyst.