| Summary: | As promising heterojunction photocatalysts, the binary CdS-based heterojunctions were investigated extensively. In most of the reported CdS-based heterojunctions, however, electrons come from the semiconductor with wide band gap (e.g., TiO<sub>2</sub>) would limit the visible-light absorption of CdS and hence lower the performance. In this work, we introduced 1T-MoS<sub>2</sub> to form a novel ternary heterojunction, namely CdS/1T-MoS<sub>2</sub>/TiO<sub>2</sub>, in which 1T-MoS<sub>2</sub> has more positive conduction band than CdS and TiO<sub>2</sub>. The hydrogen evolution rate of CdS/1T-MoS<sub>2</sub>/TiO<sub>2</sub> reaches 3.15 mmol g<sup>−1</sup> h<sup>−1</sup>, which is approximately 12 and 35 times higher than that of pure CdS and CdS/TiO<sub>2</sub> binary heterojunction under the same conditions, respectively. This performance enhancement could be attributed to the presence of 1T-MoS<sub>2</sub> and a plausible mechanism is proposed based on photoelectrochemical characterizations. Our results illustrate that the performance of CdS-based heterojunctions for solar hydrogen evolution can be greatly improved by appropriate materials selection.
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