Mott–Schottky Heterostructure Enhance the Sulfur Sites Metallicity of MoS <sub>2</sub> for pH-Universal Hydrogen Evolution with Pt-Like Activity

MoS2 have been regarded as promising catalysts for the hydrogen evolution reaction (HER). However, although it shows significant HER activity in acidic environment, its poor catalytic performance in neutral and alkaline solution would be problematic for the practical application. Herein, a pH-universal adaptability Mott–Schottky heterostructure (MSH) has been constructed via an in-situ lithiation method. The constructed MSH structure can effectively improve the sulfur sites’ electronic conductivity with metallicity and enhance the proton adsorption property under all pH conditions. To achieve the current density of 10 mA cm-2, it only needs overpotentials of 91, 138 and 128 mV in 0.5 M H2SO4, 1.0 M KOH and 1.0 M PBS, respectively, which has been one of the best values of current noble-metal-free electrocatalysts and appeals more to industrial applications. This work can pave a valuable approach for the design high activity electrocatalysts for pH-universal with Pt-like activity.