One-Step Preparation of Graphene-Supported Anatase TiO2 with Exposed {001} Facets and Mechanism of Enhanced Photocatalytic Properties

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• 作者：Liuan Gu ; Jingyu Wang ; Hao Cheng ; Yizhi Zhao ; Lifei Liu ; Xijiang Han
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2013
• 出版时间：April 24, 2013
• 年：2013
• 卷：5
• 期：8
• 页码：3085-3093
• 全文大小：518K
• 年卷期：v.5,no.8(April 24, 2013)
• ISSN：1944-8252

文摘

Anatase TiO₂ nanosheets supported on reduced graphene oxide (RGO) were synthesized via a one-step, solvothermal method. During the solvothermal step, graphene oxide (GO) was reduced to RGO, and, subsequently, anatase TiO₂ with 73.7% exposed {001} facets was grown in situ on the surfaces of the RGO nanosheets. Compared with pure TiO₂, the RGO/TiO₂ hybrid nanocomposite had improved photoactivity as a result of effective photoinduced electron transfer from TiO₂ to the RGO acceptor through interfacial interactions. Trapping tests showed that the oxidation of dye molecules proceeded for about 22% through the reaction with 鈥?/sup>OH radicals, and the remaining 78% occurred via direct interactions with holes. The holes left in TiO₂ crystals were the main reason for the enhanced photocatalytic properties of the RGO/TiO₂ composite. This paper not only reports the fabrication of highly active photocatalysts but also gives deeper insight into the photocatalytic mechanism of carbon/TiO₂ composites.

Keywords:

RGO/TiO₂ hybrid nanocomposites; TiO₂ {001} facets; photocatalytic mechanism