期刊
ACS APPLIED ENERGY MATERIALS
卷 4, 期 10, 页码 11836-11843出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c02606
关键词
graphitic carbon nitride; noble-metal-free photocatalyst; photocatalytic hydrogen evolution; in situ synthesis; gas-solid reaction
资金
- Opening Project of the Key Laboratory of Polyoxometalate and Reticular Material Chemistry of the Ministry of Education
The study developed a noble-metal-free g-CN/MoS2 composite photocatalyst with significantly enhanced hydrogen evolution rate. By introducing rodlike MoS2 as a cocatalyst, the overpotential for hydrogen evolution was successfully reduced, providing a convenient method for synthesizing transition metal sulfides based on graphitic carbon nitride.
Dependence on a noble metal cocatalyst is one of the main obstacles to the practical application of graphitic carbon nitride (g-CN) for photocatalytic hydrogen evolution. In this paper, a noble-metal-free photocatalyst, g-CN/MoS2 composite, was in situ synthesized via a gas-solid reaction where rodlike MoO3 was sulfurized to form MoS2 by the byproduct generated during the thermal condensation of thiourea, the precursor of g-CN. The composite exhibited an enhanced photocatalytic activity under irradiation of visible light, whose hydrogen evolution rate increased from 0.99 to 13.31 mu mol.h(-1), 13.44 times higher than that of pristine g-CN. On the basis of a series of characterization results, the formation and photocatalysis mechanism of g-CN/MoS2 was proposed, and the enhancement was attributed to the introduction of rodlike MoS2, which played the role as the cocatalyst instead of a noble metal to reduce the hydrogen evolution overpotential. This work provides a convenient method to synthesize a transition metal sulfide based on graphitic carbon nitride.
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