Citation: HAO Xu-Qiang, YANG Hao, JIN Zhi-Liang, XU Jing, MIN Shi-Xiong, LÜ Gong-Xuan. Quantum Confinement Effect of Graphene-Like C₃N₄ Nanosheets for Efficient Photocatalytic Hydrogen Production fromWater Splitting[J]. Acta Physico-Chimica Sinica, ;2016, 32(10): 2581-2592. doi: 10.3866/PKU.WHXB201606226 shu

Quantum Confinement Effect of Graphene-Like C₃N₄ Nanosheets for Efficient Photocatalytic Hydrogen Production fromWater Splitting

1.
School of Chemistry and Chemical Engineering, Beifang University of Nationalities, Yinchuan 750021, P. R. China;
2.
State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, P. R. China

Received Date: 21 April 2016
Revised Date: 21 June 2016

Fund Project: The project was supported by the National Natural Science Foundation of China (21263001, 21463001, 21433007).

Nanosheet materials obtained from laminar compounds are new two-dimensional anisotropic nanomaterials that can even reach the sub-nanometer scale. These materials possess unique physical and chemical properties. An example of such a nanosheet materials is graphitic carbon nitride (g-C₃N₄) nanosheets transformed from bulk g-C₃N₄. Here, g-C₃N₄ nanosheets were prepared from bulk g-C₃N₄ by high-temperature thermal oxidation. The photocatalytic activity of eosin (EY)-sensitized g-C₃N₄ nanosheets for hydrogen evolution was about 2.6 times higher than that of bulk g-C₃N₄. The structure of the g-C₃N₄ nanosheets and process of electron transfer between EY and the g-C₃N₄ nanosheets were investigated by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) analysis, fluorescence spectroscopy, and photoelectrochemical measurements. The g-C₃N₄ nanosheets possessed high specific surface area. The g-C₃N₄ nanosheets not only effectively absorbed dye molecules, but also enhanced the separation and electron transport efficiencies of photogenerated charges because of their quantum confinement effect. The quantum confinement effect of g-C₃N₄ nanosheets widened their bandgap, improved electron transfer ability along the in-plane direction, and lengthened the lifetime of photoexcited charge carriers. As a result, the photocatalytic activity of the g-C₃N₄ nanosheets was improved compared with that of bulk g-C₃N₄.
- g-C₃N₄ nanosheet,
- Dye-sensitization,
- Quantum confinement effect,
- Photocatalysis,
- Hydrogen evolution
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通讯作者: 陈斌, bchen63@163.com

Quantum Confinement Effect of Graphene-Like C₃N₄ Nanosheets for Efficient Photocatalytic Hydrogen Production fromWater Splitting