Boron doped graphitic carbon nitride dots dispersed on graphitic carbon nitride/graphene hybrid nanosheets as high performance photocatalysts for hydrogen evolution reaction

被引:42
作者
Zhao, Jingli [1 ]
Liu, Yushan [1 ]
Wang, Yaping [1 ,2 ]
Li, Huijie [1 ]
Wang, Jianshe [1 ]
Li, Zhongjun [1 ]
机构
[1] Zhengzhou Univ, Coll Chem & Mol Engn, Zhengzhou 450001, Henan, Peoples R China
[2] Zhengzhou Normal Univ, Coll Chem & Chem Engn, Zhengzhou 450044, Henan, Peoples R China
关键词
Carbon nitride; Reduction graphene oxide; Boron doped graphitic carbon nitride dots; Photocatalytic hydrogen evolution; G-C3N4; NANOSHEETS; H-2; EVOLUTION; QUANTUM DOTS; CHARGE SEPARATION; WATER; COCATALYST; GENERATION; GRAPHENE; SEMICONDUCTORS; NANOPARTICLES;
D O I
10.1016/j.apsusc.2018.11.138
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
Ternary hybrid photocatalysts have been prepared consisting Boron doped graphitic carbon nitride dots (BCNDs) dispersed on high-surface-area graphitic carbon nitride/reduced graphene oxide (g-C3N4/rGO) hybrid nanosheets. The overall procedure was developed in four stages. First, g-C3N4 nanosheets with positive charge and graphene oxide (GO) nanosheets with negative charge were prepared by treating bulk g-C3N4 in nitric acid and using the modified Hummer's method, respectively. Second, mixing the two solution with opposite charge, g-C3N4/rGO hybrid nanosheets will form under the driving of electrostatic gravity. Next, the BCNDs were introduced onto the surface of g-C3N4/rGO hybrid nanosheets through hydrothermal process. Finally, the resulting ternary hybrid photocatalysts were tested for photocatalytic hydrogen evolution reaction. The ternary photocatalysts exhibited a high hydrogen evolution rate of 741.4 mu mol.h(-1).g(-1) and an apparent quantum efficiency of 19.0% at 420 nm. Compared with binary hybrid photocatalysts, the experiments results indicate that ternary photocatalysts can efficiently suppress electron-hole pairs recombination and improve the photocatalytic performance.
引用
收藏
页码:923 / 932
页数:10
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