Hydrothermal Synthesis of Novel MoS2/BiVO4 Hetero-Nanoflowers with Enhanced Photocatalytic Activity and a Mechanism Investigation

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• 作者：Honglin Li ; Ke Yu ; Xiang Lei ; Bangjun Guo ; Hao Fu ; Ziqiang Zhu
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：October 1, 2015
• 年：2015
• 卷：119
• 期：39
• 页码：22681-22689
• 全文大小：529K
• ISSN：1932-7455

文摘

The flower-like MoS₂/BiVO₄ composite with heterojunction has been successfully fabricated by a two-step approach. A possible formation mechanism of this heterostructure was investigated. The calculated valence band offset (VBO) and conduction band offset (CBO) of MoS₂/BiVO₄ heterojunction showed that the VBO and CBO of MoS₂/BiVO₄ are 1.4 and 0.3 eV, respectively, implying the formation of well-defined staggered type II band alignment. The photodegradation of methylene blue (MB) was adopted to assess the photocatalytic ability of the pristine MoS₂ and BiVO₄ as well as MoS₂/BiVO₄ composites. It exhibited that the MoS₂/BiVO₄ composite structures performed much better than that of the pristine MoS₂ and BiVO₄, which was due to the staggered band alignment formed between the two structures. Besides, the corresponding mechanism of enhanced photocatalysis regarding the separation of the photogenerated electron鈥揾ole pairs for the heterojunction has also been investigated by the first-principles calculation.