Controlling 1T/2H heterophase junctions in the MoS2 microsphere for the highly efficient photocatalytic hydrogen evolution

Abstract

The 1T/2H heterophase junction MoS₂ 2D nanolayer for assembly into microspheres were fabricated through a simple one-step hydrothermal synthesis. These unique junction structure MoS₂ microspheres facilitate the separation of the electron–hole between different phases for forming the built-in electric field in the nanolayer. The content of 1T/2H heterophase junctions could be effectively regulated by simple changing the molar ratio of the Mo/S source in the synthesis processes. The prepared MoS₂ microspheres as a photocatalyst enable the effective hydrogen production from water. The hydrogen production activity of the photocatalyst is dependent on the content of the heterophase junctions. The hydrogen production rate was the highest up to 22.4 μmol h⁻¹ on the optimal sample MS (1 : 2).