Photocatalytic hydrogen production over Aurivillius compound Bi3TiNbO9 and its modifications by Cr/Nb co-doping
文献类型：期刊论文
| 作者 | Jiang, Lu ; Ni, Shuang ; Liu, Gang ; Xu, Xiaoxiang |
| 刊名 | APPLIED CATALYSIS B-ENVIRONMENTAL
 |
| 出版日期 | 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 |
| 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. |
入库方式： OAI收割
来源：金属研究所
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