Citation: Kelin He, Jun Xie, Xingyi Luo, Jiuqing Wen, Song Ma, Xin Li, Yueping Fang, Xiangchao Zhang. Enhanced visible light photocatalytic H₂ production over Z-scheme g-C₃N₄ nansheets/WO₃ nanorods nanocomposites loaded with Ni(OH)_x cocatalysts[J]. Chinese Journal of Catalysis, ;2017, 38(2): 240-252. doi: 10.1016/S1872-2067(17)62759-1 shu

Enhanced visible light photocatalytic H₂ production over Z-scheme g-C₃N₄ nansheets/WO₃ nanorods nanocomposites loaded with Ni(OH)_x cocatalysts

Kelin He ^a,b,c, ,
Jun Xie ^a,b,c ,
Xingyi Luo ^a,c ,
Jiuqing Wen ^a,b,c ,
Song Ma ^a,b,c ,
Xin Li ^a,b,c ,
Yueping Fang ^a ,
Xiangchao Zhang ^d

a College of Materials and Energy, Guangzhou 510642, Guangdong, China;
b College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou 510642, Guangdong, China;
c Key Laboratory of Energy Plants Resource and Utilization, Ministry of Agriculture, Key Laboratory of Biomass Energy of Guangdong Regular Higher Education Institutions, Institute of New Energy and New Materials, South China Agricultural University, Guangzhou 510642, Guangdong, China;
d Hunan Key Laboratory of Applied Environmental Photocatalysis, Changsha University, Changsha 410022, Hunan, China

Received Date: 30 October 2016
Revised Date: 20 November 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (51672089), the Industry and Research Collaborative Innovation Major Projects of Guangzhou (201508020098), the State Key Laboratory of Advanced Technology for Material Synthesis and Processing (Wuhan University of Technology) (2015-KF-7) and the Hunan Key Laboratory of Applied Environmental Photocatalysis (Changsha University) (CCSU-XT-04).

Novel WO₃/g-C₃N₄/Ni(OH)_x hybrids have been successfully synthesized by a two-step strategy of high temperature calcination and in situ photodeposition. Their photocatalytic performance was investigated using TEOA as a hole scavenger under visible light irradiation. The loading of WO₃ and Ni(OH)_x cocatalysts boosted the photocatalytic H₂ evolution efficiency of g-C₃N₄. WO₃/g-C₃N₄/Ni(OH)_x with 20 wt% defective WO₃ and 4.8 wt%Ni(OH)_x showed the highest hydrogen production rate of 576 μmol/(g·h), which was 5.7, 10.8 and 230 times higher than those of g-C₃N₄/4.8 wt%Ni(OH)_x, 20 wt%WO₃/C₃N₄ and g-C₃N₄ photocatalysts, respectively. The remarkably enhanced H₂ evolution performance was ascribed to the combination effects of the Z-scheme heterojunction (WO₃/g-C₃N₄) and loaded cocatalysts (Ni(OH)_x), which effectively inhibited the recombination of the photoexcited electron-hole pairs of g-C₃N₄ and improved both H₂ evolution and TEOA oxidation kinetics. The electron spin resonance spectra of ^·O_2^- and ·OH radicals provided evidence for the Z-scheme charge separation mechanism. The loading of easily available Ni(OH)_x cocatalysts on the Z-scheme WO₃/g-C₃N₄ nanocomposites provided insights into constructing a robust multi-ple-heterojunction material for photocatalytic applications.
- Photocatalytic hydrogen evolution,
- Robust Ni(OH)_x cocatalyst,
- g-C₃N₄,
- Z-Scheme systems,
- Heterojunction
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Enhanced visible light photocatalytic H₂ production over Z-scheme g-C₃N₄ nansheets/WO₃ nanorods nanocomposites loaded with Ni(OH)_x cocatalysts