Multi-stepwise charge transfer via MOF@MOF/TiO2 dual-heterojunction photocatalysts towards hydrogen evolution

被引:58
作者
Chen, Yao [1 ,4 ]
Yang, Dong [2 ,3 ]
Xin, Xin [1 ,2 ,4 ]
Yang, Zhongshan [5 ]
Gao, Yuchen [1 ,4 ]
Shi, Yonghui [1 ,4 ]
Zhao, Zhanfeng [1 ,4 ]
An, Ke [1 ,4 ]
Wang, Wenjing [1 ,2 ,4 ]
Tan, Jiangdan [1 ,4 ]
Jiang, Zhongyi [1 ,4 ,6 ]
机构
[1] Tianjin Univ, Sch Chem Engn & Technol, Key Lab Green Chem Technol, Tianjin 300072, Peoples R China
[2] Tianjin Univ, Sch Chem Engn & Technol, Minist Educ, Key Lab Syst Bioengn, Tianjin 300072, Peoples R China
[3] Tianjin Univ, Sch Environm Sci & Engn, Tianjin 300072, Peoples R China
[4] Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300072, Peoples R China
[5] Tianjin Univ, TJU NIMS Int Collaborat Lab, Sch Mat Sci & Engn, Tianjin 300072, Peoples R China
[6] Joint Sch Natl Univ Singapore & Tianjin Univ, Int Campus, Fuzhou 350207, Peoples R China
基金
中国国家自然科学基金;
关键词
METAL-ORGANIC FRAMEWORKS; ARTIFICIAL PHOTOSYNTHESIS; WATER; SURFACE; CONSTRUCTION; TITANIUM; NANOCOMPOSITE; SEPARATION; REDUCTION; OXIDATION;
D O I
10.1039/d1ta10270b
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
Rational manipulation of the photogenerated charge transfer inside the photocatalyst is key to enhancing the photocatalytic performance. Herein, inspired by the charge transport chain in natural photosynthesis, a novel multi-stepwise charge transfer strategy is proposed for the ingenious design of photocatalysts. To confirm the effectiveness of this strategy, a kind of MOF@MOF/TiO2 dual-heterojunction was constructed by depositing TiO2 nanoparticles on the surface of core-shell MOF@MOF hetero-frameworks. The energy band potentials of the three moieties in MOF@MOF/TiO2 exhibit a multi-stepwise characteristic, wherein the slight gradient difference of energy bands helps in deconcentrating the charge in multiple energy bands and affords a smaller interface resistance, thus rendering a high charge transfer efficiency. Accordingly, compared with the single-heterojunction counterparts with one-step charge transfer including MOF@MOF and MOF/TiO2, the MOF@MOF/TiO2 dual-heterojunction achieves a much higher photocatalytic hydrogen evolution rate of 7.108 mmol g(-1) h(-1) under full-spectrum irradiation. This study may offer a deep insight into the charge transfer behavior in the photocatalytic process, along with the rational design of high-performance photocatalysts for sustainable energy conversion applications.
引用
收藏
页码:9717 / 9725
页数:9
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