Super-stable SnO/MoS 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/MoS coupled nanosheet array on carbon cloth (CC@SnO/MoS), exhibiting an overpotential of 166 mV at a current density of 10 mA cm. According to the results of various tests and theoretical calculations, it is shown that the establishment of SnO/MoS interface engineering is to accelerate the electron transmission on the heterogeneous interface and S defects on the edge of MoS, and finally improve the conductivity and catalytic activity of the catalyst. More importantly, the formation of an SnO interface layer during 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.