Abstract
The development of efficient photocatalysts is a very interesting topic for sustainable hydrogen production using solar energy. In this paper, Mn0.2Cd0.8S was loaded on CoMoO4 nanorods by in-situ solvothermal method. Through morphological control, two rod-shaped elemental materials were loaded in situ to construct a composite with a ball shaped bouquet structure. The Mn0.2Cd0.8S/CoMoO4 photocatalyst with enriched oxygen vacancies was synthesized by high-temperature annealing. It is worth noting that by constructing an heterojunction, the Mn0.2Cd0.8S/CoMoO4 photocatalyst exhibits high catalytic activity and stability. The optimal H2 production rate of Mn0.2Cd0.8S/CoMoO4 was 7.04 mmol·g−1·h−1. Surprisingly, the hydrogen production rate of the composite was 35.88 times that of CoMoO4. Density functional theory (DFT) calculations showed that Mn0.2Cd0.8S/CoMoO4 has electron attraction ability and strong conductivity. X-ray photoelectron spectroscopy (XPS) confirmed the charge transfer path of the heterojunction between Mn0.2Cd0.8S and CoMoO4, which greatly promoted the spatial charge separation. This work provides a reference for combining heterojunction design with defect engineering to achieve efficient conversion of solar energy to chemical energy.
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