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分享：二氧化钛修饰石墨烯功能材料
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Synthesis of TiO2 nanorod-decorated graphene sheets and their highly efficient photocatalytic activities under visible-light irradiation Eunwoo Lee, Jin-Yong Hong, Haeyoung Kang, Jyongsik Jang , World Class University (WCU) Program of Chemical Convergence for Energy & Environment (C2E2), School of Chemical and Biological Engineering, College of Engineering, Seoul National University (SNU), 599 Gwanangno, Gwanak-gu, Seoul 151–742, Republic of Korea Received 29 August 2011; revised 30 November 2011; Accepted 10 December 2011. Available online 19 December 2011. Abstract The titanium dioxide (TiO2) nanorod-decorated graphene sheets photocatalysts with different TiO2 nanorods population have been synthesized by a simple non-hydrolytic sol–gel approach. Electron microscopy and X-ray diffraction analysis indicated that the TiO2 nanorods are well-dispersed and successfully anchored on the graphene sheet surface through the formation of covalent bonds between Ti and C atoms. The photocatalytic activities are evaluated in terms of the efficiencies of photodecomposition and adsorption of methylene blue (MB) in aqueous solution under visible-light irradiation. The as-synthesized TiO2 nanorod-decorated graphene sheets showed unprecedented photodecomposition efficiency compared to the pristine TiO2 nanorods and the commercial TiO2 (P-25, Degussa) under visible-light. It is believed that this predominant photocatalytic activity is due to the synergistic contribution of both a retarded charge recombination rate caused by a high electronic mobility of graphene and an increased surface area originated from nanometer-sized TiO2 nanorods. Furthermore, photoelectrochemical study is performed to give deep insights into the primary roles of graphene that determines the photocatalytic activity.[ Last edited by captainsun on 2011-12-27 at 21:16 ] |
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