| Summary: | Design and fabrication of efficient and stable photocatalysts are critically required for practical applications of solar water splitting. Herein, a series of WSe<sub>2</sub>/TiO<sub>2</sub> nanocomposites were constructed through a facile mechanical grinding method, and all of the nanocomposites exhibited boosted photocatalytic hydrogen evolution. It was discovered that the enhanced photocatalytic performance was attributed to the efficient electron transfer from TiO<sub>2</sub> to WSe<sub>2</sub> and the abundant active sites provided by WSe<sub>2</sub> nanosheets. Moreover, the intimate heterojunction between WSe<sub>2</sub> nanosheets and TiO<sub>2</sub> favors the interfacial charge separation. As a result, a highest hydrogen evolution rate of 2.28 mmol/g·h, 114 times higher than pristine TiO<sub>2</sub>, was obtained when the weight ratio of WSe<sub>2</sub>/(WSe<sub>2</sub> + TiO<sub>2</sub>) was adjusted to be 20%. The designed WSe<sub>2</sub>/TiO<sub>2</sub> heterojunctions can be regarded as a promising photocatalysts for high-throughput hydrogen production.
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