Citation: Xin Li, Chongyang Liu, Dongyao Wu, JinZe Li, Pengwei Huo, Huiqin Wang. Improved charge transfer by size-dependent plasmonic Au on C₃N₄ for efficient photocatalytic oxidation of RhB and CO₂ reduction[J]. Chinese Journal of Catalysis, ;2019, 40(6): 928-939. doi: S1872-2067(19)63347-4 shu

Improved charge transfer by size-dependent plasmonic Au on C₃N₄ for efficient photocatalytic oxidation of RhB and CO₂ reduction

a Institute of Green Chemistry and Chemical Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China;
b School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China

Received Date: 9 December 2018
Revised Date: 1 March 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (21776117 and 21576125), China Postdoctoral Science Foundation (2017M611716 and 2017M611734), Six Talent Peaks Project in Jiangsu Province (XCL-014), and Zhenjiang Science and Technology Program (SH2016012).

A series of Au/g-C₃N₄ (Au/CN) nanocomposites were successfully prepared, where g-C₃N₄ nanosheets (CN NSs) served as a substrate for the growth of different sized Au nanoparticles (Au NPs) using the constant temperature bath-reduction method. The effect of Au NP size on electron transfer efficiency between the interfaces of the nanocomposite was studied. The three-dimensional finite-difference time-domain results revealed that larger Au NPs showed increased strength of the localized surface plasmon resonance effect. An increased number of high-energy electrons were available for transfer from Au NPs to CN under the visible light irradiation, inhibiting electron transfer from CN to Au NPs. Photoelectrochemical performance analysis showed that smaller Au NPs exhibited higher separation efficiency of the electron-hole pairs photo-generated with reasonable distribution density. These results are favorable for the improvement of photocatalytic performance. Compared to other nanocomposites, the 3-Au/CN sample (prepared using 3 mL HAuCl₄ solution) with reasonable distribution density and small Au NPs exhibited the best photodegradation activity (92.66%) of RhB in 30 min under the visible light irradiation and photoreduction performance of CO₂ to CO and CH₄ with yields of 77.5 and 38.5 μmol/g, respectively, in 8 h under UV light irradiation. Considering the experimental results in the context of the literature, a corresponding size-dependent photocatalytic mechanism was proposed.
- Au/g-C₃N₄,
- Nanosheet,
- Size dependence,
- CO₂ photoreduction,
- Photocatalyst
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Improved charge transfer by size-dependent plasmonic Au on C3N4 for efficient photocatalytic oxidation of RhB and CO2 reduction

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通讯作者: 陈斌, bchen63@163.com

Improved charge transfer by size-dependent plasmonic Au on C₃N₄ for efficient photocatalytic oxidation of RhB and CO₂ reduction