Enhanced Photocatalytic CO2Reduction and Water Splitting Over a Boron-Rich Alloy Boron Suboxide (B6O) via Cr or Co Doping

被引:2
|
作者
Yang, Qiang [1 ]
Liu, Jiali [1 ]
Yan, Dejian [1 ]
Liu, Jikai [1 ,2 ]
Luo, He'an [1 ,2 ]
机构
[1] Xiangtan Univ, Sch Chem Engn, Xiangtan 411105, Peoples R China
[2] Xiangtan Univ, Natl & Local United Engn Res Ctr Chem Proc Simula, Xiangtan 411105, Peoples R China
关键词
Boron-rich alloys; Photocatalytic CO(2)reduction; Photocatalytic water splitting; Transition metal doping; GRAPHITIC CARBON NITRIDE; DOPED TIO2; HYDROGEN-PRODUCTION; METAL-FREE; THIN-FILMS; EFFICIENT; REDUCTION; CONSTRUCTION; DEGRADATION; PHOTOANODE;
D O I
10.1007/s10562-020-03111-4
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
Boron-rich alloy boron suboxide (B6O) as a novel metal-free photocatalyst was recently explored for photocatalytic CO(2)reduction and water splitting. However, to broaden the potential applications of B6O in the field, further improving its activity and understanding its fundamental chemical properties are essential. Herein, transition metal doping (Cr or Co) is designed to engineer the band structure of B6O via a solid state reaction. The valence band edge of Cr or Co doped B6O is proposed to be more positive than that of pristine B6O while the original conduction band of B6O is not much influenced by doping, contributing to the better light harvesting ability and lower charge recombination rate of doped B6O. The photocatalytic and photoelectrochemical (PEC) performances of doped B6O were therefore remarkably enhanced. The apparent quantum yields (AQY) of 20 wt% Cr or Co doped B6O are much higher than that of pristine B6O. In addition, the 20 wt% Cr doped B6O exhibits the best electrical conductivity and photocatalytic performance compared with the Co doped B6O and pristine B6O. The present work demonstrates a facile and effective strategy to engineer the band structure and reduce the charge migration resistance of B6O. Graphic
引用
收藏
页码:2497 / 2509
页数:13
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