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Photocatalytic hydrogen production over Aurivillius compound Bi3TiNbO9 and its modifications by Cr/Nb co-doping
Jiang, Lu ; Ni, Shuang ; Liu, Gang ; Xu, Xiaoxiang
刊名APPLIED CATALYSIS B-ENVIRONMENTAL
2017-11-15
卷号217页码:342-352
关键词Bi3TiNbO9 Cr/Nb co-doping Hydrogen production Photocatalysis DFT calculation
ISSN号0926-3373
通讯作者Xu, XX (reprint author), Tongji Univ, Shanghai Key Lab Chem Assessment & Sustainabil, Sch Chem Sci & Engn, 1239 Siping Rd, Shanghai 200092, Peoples R China.
中文摘要In this work, we have applied Cr/Nb co-doping strategy to the wide band gap semiconductor Bi3TiNbO9 and have performed a detailed investigation on the structure, optical and photocatalytic properties of these modified Aurivillius compounds Bi3Ti1-2xCrxNb1+xO9 (x=0, 0.1, 0.2, 0.3). Our results suggest that Cr/Nb doping slightly expand the unit cell of Bi3TiNbO9 with a doping limit around 20%. The involvement of Cr/Nb dopants in the crystal structure significantly reduces the band gap of Bi3TiNbO9 by nearly 1 eV. Photocatalytic experiments and photoelectrochemical measurements confirms the critical role of Cr/Nb dopants in improving photocatalytic hydrogen production and anodic photocurrent. More than two-fold enhancement in hydrogen production has been noticed for merely 10% Cr/Nb co-doping. The highest photocatalytic activity belongs to Bi3Ti0.8Cr0.1Nb1.1O9 (x=0.1) for full range illumination and to Bi3Ti0.6Cr0.2Nb1.2O9 (x=0.2) for visible light illumination, with apparent quantum efficiency (AQE) approaching 0.52% and 0.27%, respectively. DFT calculation discloses the role of Cr in forming a new valence band inside the band gap of Bi3TiNbO9. In addition, strong anisotropic phenomenon in charge transportation of Bi3TiNbO9 is also verified by DFT, as both conduction band minimum (CBM) and valence band maximum (VBM) are buried in the [BiTiNbO7](2-) perovskite slabs and charges are only allowed to migrate within the slabs. (C) 2017 Elsevier B.V. All rights reserved.
学科主题Chemistry, Physical ; Engineering, Environmental ; Engineering, Chemical
收录类别SCI
资助信息National Natural Science Foundation of China [21401142]; Shanghai Science and Technology Commission [14DZ2261100]; Fundamental Research Funds for the Central Universities
语种英语
公开日期2017-08-17
内容类型期刊论文
源URL[http://ir.imr.ac.cn/handle/321006/78002]  
专题金属研究所_中国科学院金属研究所
推荐引用方式
GB/T 7714
Jiang, Lu,Ni, Shuang,Liu, Gang,et al. Photocatalytic hydrogen production over Aurivillius compound Bi3TiNbO9 and its modifications by Cr/Nb co-doping[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2017,217:342-352.
APA Jiang, Lu,Ni, Shuang,Liu, Gang,&Xu, Xiaoxiang.(2017).Photocatalytic hydrogen production over Aurivillius compound Bi3TiNbO9 and its modifications by Cr/Nb co-doping.APPLIED CATALYSIS B-ENVIRONMENTAL,217,342-352.
MLA Jiang, Lu,et al."Photocatalytic hydrogen production over Aurivillius compound Bi3TiNbO9 and its modifications by Cr/Nb co-doping".APPLIED CATALYSIS B-ENVIRONMENTAL 217(2017):342-352.
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