Facile one-pot solvothermal preparation of Mo-doped Bi₂WO₆ biscuit-like microstructures for visible-light-driven photocatalytic water oxidation
2016
Etogo, Atangana | Liu, Ren | Ren, Jiabin | Qi, Liwen | Zheng, Changcheng | Ning, Jiqiang | Zhong, Yijun | Hu, Yong
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 (λ > 420 nm), with an average O₂ evolution rate of up to 147.2 μmol 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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