Photocatalytic H2 evolution on MoS2–TiO2 catalysts synthesized via mechanochemistry†
At present, composite photocatalysts containing MoS2 as a co-catalyst and a subjective semiconductor material are usually obtained via various complex reduction methods using NH4MoS4 or Na2MoO4 as a precursor. In this work, a simple method was proposed to synthesize MoS2–TiO2 composite photocatalysts via mechanochemistry using MoS2 as a direct precursor. 4.0% MoS2–TiO2 after ball-milling at 300 rpm for 2 h possessed the maximum photocatalytic activity for H2 evolution. The rate of H2 evolution was up to 150.7 μmol h−1, which was 48.6 times higher than that of pure TiO2. The MoS2–TiO2 composite possesses stable photocatalytic performance for H2 evolution. Photoelectrochemical measurements confirmed the electronic interaction between TiO2 and MoS2. The photo-generated electrons on the conduction band of TiO2 could easily transfer to the MoS2 co-catalyst, which promoted efficient charge separation and improved the photocatalytic performance.