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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; Xu, XX (reprint author), Tongji Univ, Shanghai Key Lab Chem Assessment & Sustainabil, Sch Chem Sci & Engn, 1239 Siping Rd, Shanghai 200092, Peoples R China.
2017-11-15
Source PublicationAPPLIED CATALYSIS B-ENVIRONMENTAL
ISSN0926-3373
Volume217Pages:342-352
AbstractIn 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.; 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.
description.department[jiang, lu ; xu, xiaoxiang] tongji univ, shanghai key lab chem assessment & sustainabil, sch chem sci & engn, 1239 siping rd, shanghai 200092, peoples r china ; [ni, shuang] china acad engn phys, laser fus res ctr, sci & technol plasma phys lab, mianyang 621900, peoples r china ; [liu, gang] chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china
KeywordBi3tinbo9 Cr/nb Co-doping Hydrogen Production Photocatalysis Dft Calculation
Subject AreaChemistry, Physical ; Engineering, Environmental ; Engineering, Chemical
Funding OrganizationNational Natural Science Foundation of China [21401142]; Shanghai Science and Technology Commission [14DZ2261100]; Fundamental Research Funds for the Central Universities
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78002
Collection中国科学院金属研究所
Corresponding AuthorXu, XX (reprint author), Tongji Univ, Shanghai Key Lab Chem Assessment & Sustainabil, Sch Chem Sci & Engn, 1239 Siping Rd, Shanghai 200092, Peoples R China.
Recommended Citation
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,&Xu, XX .(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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