Citation: Qiuyu Chen, Sijia Li, Hongyi Xu, Guofeng Wang, Yang Qu, Peifen Zhu, Dingsheng Wang. Co-MOF as an electron donor for promoting visible-light photoactivities of g-C₃N₄ nanosheets for CO₂ reduction[J]. Chinese Journal of Catalysis, ;2020, 41(3): 514-523. doi: S1872-2067(19)63497-2 shu

Co-MOF as an electron donor for promoting visible-light photoactivities of g-C₃N₄ nanosheets for CO₂ reduction

a Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, Heilongjiang, China;
b Department of Physics and Engineering Physics, The University of Tulsa, Tulsa, OK 74104, USA;
c Department of Chemistry, Tsinghua University, Beijing 100084, China

Received Date: 15 July 2019
Revised Date: 23 August 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (21871079,21501052), and the Outstanding Youth Project of Natural Science Foundation of Heilongjiang Province (YQ2019B006).

A possible mechanism for boosting the visible-light photoactivities of graphitic carbon nitride (g-C₃N₄) nanosheets for CO₂ reduction via coupling with the electron donor Co-metal-organic framework (MOF) is proposed in this study. Specifically, Co-MOF as an electron donor is capable of transferring the photogenerated electrons in the lowest unoccupied molecular orbital (LUMO) to the conduction band of g-C₃N₄ to facilitate charge separation. As expected, the prepared Co-MOF/g-C₃N₄ nanocomposites display excellent visible-light-driven photocatalytic CO₂ reduction activities. The CO production rate of 6.75 µmol g^-1 h^-1 and CH₄ evolution rate of 5.47 µmol g^-1 h^-1 are obtained, which are approximately 2 times those obtained with the original g-C₃N₄ under the same conditions. Based on a series of analyses, it is shown that the introduction of Co-MOF not only broadens the range of visible-light absorption but also enhances the charge separation, which improves the photocatalytic activity of g-C₃N₄ to a higher level. In particular, the hydroxyl radical (·OH) experiment was operated under 590 nm (single-wavelength) irradiation, which further proved that the photogenerated electrons in the LUMO of Co-MOF can successfully migrate to g-C₃N₄. This work may provide an important strategy for the design of highly efficient g-C₃N₄-based photocatalysts for CO₂ reduction.
- Co-MOF,
- g-C₃N₄ nanosheets,
- Charge separation,
- Visible-light photoactivity,
- Photocatalytic CO₂ conversion
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通讯作者: 陈斌, bchen63@163.com

Co-MOF as an electron donor for promoting visible-light photoactivities of g-C₃N₄ nanosheets for CO₂ reduction