Rich active-edge-site MoS2 anchored on reduction sites in metal sulfide heterostructure: Toward robust visible light photocatalytic hydrogen sulphide splitting

In this work, the unsaturated-sulfur-edge-rich (U-s-rich) MoS2 was successfully introduced in MnS/In2S3 composites by a smart S-vacancies-induced strategy. The surface chemical state analysis, photoluminescence (PL) spectra and electron spin resonance (ESR) spectra confirm that the MoS2 with rich U-s can selectively grow on the MnS of MnS/In2S3 composites resulting in the formation of a typical double-interface-structure. The linear sweep voltammetry (LSV) test confirms that the U-s-rich MoS2 processed superior proton reduction activity. Moreover, the superb charge transfer efficiency from MnS to MoS2 and remarkable HS- adsorption performance were verified by the density functional theory (DFT) calculations. As a result, the novel MnS/In2S3-MoS2 (denoted as MI-M) is the state-of-the-art non-noble-metal visible light driven photocatalysts with H-2 evolution rate of 124 mu mol h(-1) from H2S which is 4.5 times higher than that of the pristine MnS/In2S3 heterostructure. The corresponding apparent quantum efficiency (AQE) at 400 nm is as high as 72%.