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- Title
Enhancing the Efficiency of Water Oxidation by Boron-Doped BiVO<sub>4</sub> under Visible Light: Hole Trapping by BO<sub>4</sub> Tetrahedra.
- Authors
Li, Yanqing; Jing, Tao; Liu, Yuanyuan; Huang, Baibiao; Dai, Ying; Zhang, Xiaoyang; Qin, Xiaoyan; Whangbo, Myung‐Hwan
- Abstract
Boron-doped monoclinic and tetragonal phases of BiVO4 were prepared by using the urea precipitation method, and the visible- light photocatalytic activities of pristine and boron-doped BiVO4 for oxygen generation from water were compared. Boron doping enhances the photocatalytic activities of BiVO4. The reasons for this enhancement were probed by performing X-ray photoelectron, Raman, and electrochemical impedance spectroscopy measurements, and also by performing density functional calculations for model boron-doped BiVO4 structures. The photocatalytic activities of BiVO4 is enhanced by boron doping because the resulting BO4 tetrahedra, which are smaller than the VO4 tetrahedra, create an occupied defect level per boron lying approximately 0.17 eV above the valenceband maximum of pristine BiVO4, and this defect level is localized because it is made up of the O 2p levels of the BO4 tetrahedron. Thus, the BO4 tetrahedra that result from boron doping act as hole traps, thereby slowing down the recombination of photogenerated electrons and holes.
- Subjects
OXIDATION of water; BORON; BISMUTH compounds; TETRAHEDRA; PRECIPITATION (Chemistry); PHOTOCATALYSIS
- Publication
ChemPlusChem, 2015, Vol 80, Issue 7, p1113
- ISSN
2192-6506
- Publication type
Article
- DOI
10.1002/cplu.201500110