Super-stable SnO 2 /MoS 2 enhanced the electrocatalytic hydrogen evolution in acidic environments.

For electrocatalytic hydrogen evolution in acidic environments, the stability of catalysts has always been a significant factor restricting development. Here, we prepared a superstable SnO 2 /MoS 2 coupled nanosheet array on carbon cloth (CC@SnO 2 /MoS 2 ), exhibiting an overpotential of 166 mV at a current density of 10 mA cm -2 . According to the results of various tests and theoretical calculations, it is shown that the establishment of SnO 2 /MoS 2 interface engineering is to accelerate the electron transmission on the heterogeneous interface and S defects on the edge of MoS 2 , and finally improve the conductivity and catalytic activity of the catalyst. More importantly, the formation of an SnO 2 interface layer during in situ transformation improves the stability and hydrophilicity of the material surface. We have proposed a strategy for engineering an interface with fast electron transport and proton adsorption, providing some new ideas for the design of HER catalysts in acid electrolytes.