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Regulation of morphology and charge transfer mechanism: Oxygen vacancy-rich Mn0.2Cd0.8S/CoMoO4 S-type heterojunction promoting photocatalytic hydrogen production through hydrothermal in-situ synthesis
被引：5
作者：
Shang, Yan
[1
]
Xu, Jing
[1
]
Li, Qian
[1
]
Zheng, Mingxia
[1
]
Ning, Xinjie
[1
]
机构：
[1] North Minzu Univ, Sch Chem & Chem Engn, Ningxia Key Lab Solar Chem Convers Technol, Key Lab Chem Engn & Technol,State Ethn Affairs Com, Yinchuan 750021, Ningxia, Peoples R China
关键词：
Mn;
0.2;
Cd;
0.8;
S/CoMoO;
4;
Photocatalytic hydrogen production;
S -type heterojunction;
DFT calculation;
D O I：
10.1016/j.jallcom.2024.175692
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ;
081704 ;
摘要：
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 center dot g- 1 center dot 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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页数：9
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