Bismuth Vacancy-Tuned Bismuth Oxybromide Ultrathin Nanosheets toward Photocatalytic CO2 Reduction

被引:168
作者
Di, Jun [1 ]
Chen, Chao [2 ]
Zhu, Chao [2 ]
Song, Pin [2 ]
Xiong, Jun [1 ]
Ji, Mengxia [1 ]
Zhou, Jiadong [2 ]
Fu, Qundong [2 ]
Xu, Manzhang [2 ]
Hao, Wei [2 ]
Xia, Jiexiang [1 ]
Li, Shuzhou [2 ]
Li, Huaming [1 ]
Liu, Zheng [2 ]
机构
[1] Jiangsu Univ, Inst Energy Res, Sch Chem & Chem Engn, 301 Xuefu Rd, Zhenjiang 212013, Jiangsu, Peoples R China
[2] Nanyang Technol Univ, Sch Mat Sci & Engn, Singapore 639798, Singapore
基金
中国国家自然科学基金; 新加坡国家研究基金会;
关键词
bismuth vacancies; BiOBr; ultrathin nanosheets; electronic structure; CO2; photoreduction; TOTAL-ENERGY CALCULATIONS; NITROGEN-FIXATION; EFFICIENT; PHOTOREDUCTION; BIOBR; RICH;
D O I
10.1021/acsami.9b08109
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Surface defects in semiconductors have a significant role to tune the photocatalytic reactions. However, the dominant studied defect type is oxygen vacancy, and metal cation vacancies are seldom explored. Herein, bismuth vacancies are engineered into BiOBr through ultrathin structure control and employed to tune photocatalytic CO2 reduction. V-Bi-BiOBr ultrathin nanosheets deliver a high selective CO generation rate of 20.1 mu mol g(-1) h(-1) in pure water, without any cocatalyst, photosensitizer, and sacrificing reagent, roughly 3.8 times higher than that of BiOBr nanosheets. The increased CO2 reduction activity is ascribed to the tuned electronic structure, optimized CO2 adsorption, activation, and CO desorption process over V-Bi-BiOBr ultrathin nanosheets. This work offers new opportunities for designing surface metal vacancies to optimize the CO2 photoreduction performances.
引用
收藏
页码:30786 / 30792
页数:7
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