Title: Graphene Dispersed Bi2WO6 Nanosheets with Promoted Interfacial Charge Separation for Visible Light Photocatalysis

DOI: 10.1002/cctc.201901137

Website: https://onlinelibrary.wiley.com/doi/abs/10.1002/cctc.201901137

Abstract: Promoting photogenerated charge separation is the key and bottleneck step in photocatalysis, which mainly determines the efficiency of solar energy conversion. Reduced graphene oxide (rGO) has been emerging in the fields of physics, catalysis and material sciences due to its unique structures, high catalytic activity and tunability. In this work, we introduced rGO nanosheets as support to fabricate uniformly-dispersed Bi₂WO₆ nanostructures onto the rGO surface under hydrothermal condition. The resulted rGO/Bi₂WO₆ composite exhibited superior performances in degradation of various kinds of environmental pollutions including dyes and phenol. Further electrochemical characterizations including open circuit potential, electrochemical impedance spectroscopy and electrochemical specific area indicated that incorporation of rGO evidently accelerated the interfacial charge separation and transfer. These improvements consequently contributed to largely exposed active sites and superior photocatalytic performance. Our work presented a facile strategy to tune the interfacial charge separation in semiconductor-based photocatalysts using layered materials like graphene and its derivatives.

石墨烯是光催化复合材料的常见组成，而如何使石墨烯最大化地促进光催化材料的活性依然是一个问题。我们设计了一种表面活性剂调控的钨酸铋和石墨烯原位复合水热合成法，实现了钨酸铋纳米片在石墨烯辅助下的高度分散。该方法不仅提高了复合材料的电荷传递效率，而且通过精确调控石墨烯的质量分数，实现了钨酸铋表面活性位点的最大化暴露，从而显著提高了光催化活性。该文章有实验室硕士生杨霞同学和王江飞同学在李淳老师和张静教授的指导下完成。