Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 4, Issue 34, Pages 13242-13250Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta04923k
Keywords
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Funding
- Natural Science Foundation of China [21171146, 21371152]
- Zhejiang Provincial Natural Science Foundation of China [LR14B010001]
- Zhejiang Provincial Public Welfare Project [2016C31015]
- State Key Laboratory of Silicon Materials at Zhejiang University [2015-10]
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The adsorption behavior and the separation efficiency of photogenerated electron-hole pairs are two important elements in estimating the photocatalytic activity of a photocatalyst. In this work, we have developed a facile one-pot solvothermal method for the preparation of Mo-doped Bi2WO6 with uniform three-dimensional (3D) hierarchical porous biscuit-like microstructures (PBMs). Mo doping is found to have two important roles in the synthesis of Bi2WO6 particles, leading to porous microstructures and adjusting band gaps of the Bi2MoxW1-xO6 particles. The band structure of the as-prepared porous Bi2MoxW1-xO6 products is characterized by UV-vis diffuse reflectance spectroscopy and valence-band X-ray photoelectron spectroscopy. Density functional theory (DFT) calculations give further insights into the band structure of the Bi2MoxW1-xO6 products. In all the samples, Bi2Mo0.21W0.79O6 PBMs exhibit a very efficient catalytic performance in oxidizing water under visible light irradiation (lambda > 420 nm), with an average O-2 evolution rate of up to 147.2 mu mol h(-1) g(-1) and an apparent quantum efficiency (QE) of 3.1% at 420 nm, representing a 2 times more enhancement compared with the non-doped Bi2WO6 sample. This study provides a simple method for designing metal-doped semiconductors with porous structures for different applications.
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