Covalently bonded 2D/2D O-g-C3N4/TiO2 heterojunction for enhanced visible-light photocatalytic hydrogen evolution

被引：139

作者：

Zhong, Ruyi ^{[1
,2
]}

Zhang, Zisheng ^{[1
]}

Yi, Huqiang ^{[2
]}

Zeng, Lei ^{[1
]}

Tang, Chao ^{[1
]}

Huang, Limin ^{[1
]}

Gu, Meng ^{[2
]}

机构：

[1] Southern Univ Sci & Technol, Dept Chem, Shenzhen 518055, Peoples R China

[2] Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2018年 / 237卷

关键词：

2D/2D nanocomposite; Solvothermal synthesis; Covalent heterojunction; DFT calculations; Photocatalytic hydrogen evolution; GRAPHITIC CARBON NITRIDE; 2D TIO2 NANOSHEETS; IN-SITU SYNTHESIS; TIO2/G-C3N4; HETEROJUNCTIONS; ARTIFICIAL PHOTOSYNTHESIS; CHARGE-TRANSFER; DEGRADATION; IRRADIATION; PERFORMANCE; DENSITY;

D O I：

10.1016/j.apcatb.2017.12.066

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：

Visible-light photocatalytic hydrogen evolution is a key step towards utilizing solar energy. Here we constructed covalently bonded oxidized graphitic C3N4/TiO2 (O-g-C3N4/TiO2) heterostructure with high surface area via an in-situ solvothermal synthetic strategy. The edge-anchoring of two-dimensional (2D) TiO2 on 2D O-g-C3N4 was evidenced by the HAADF-STEM EDS mapping, EELS and XPS analysis. Density functional theory computations suggest strong affinity between TiO2 and O-g-C3N4 2D structures through N-O-Ti covalent bonding, which drastically enhances the synergetic effect of the light absorption of O-g-C3N4 and high surface area of TiO2. The as-formed heterojunction can remarkably boost the visible-light photocatalytic activity for H-2 evolution by 6.1 times compared to physical mixture of TiO2 nanosheets (NS) and O-g-C3N4.

引用

页码：1130 / 1138

页数：9

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