Chem. J. Chinese Universities

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Photoelectrochemical Properties of TiO2 Coated on Carbon Nanofibers with Different Microstructure Film Electrodes

LI Zhi-Zhou1,2, CUI Xiao-Li2* , ZHENG Jun-Sheng3, WANG Qing-Fei1   

    1. College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang 050016, China;
    2. Department of Materials Science, Fudan University, Shanghai 200433, China;
    3. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
  • Received:2007-11-09 Revised:1900-01-01 Online:2008-06-10 Published:2008-06-10
  • Contact: CUI Xiao-Li

Abstract: Novel nanocomposites of TiO2 and two kinds' carbon nanofibers with different microstructure were prepared by sol-gel method. The nanocomposites were studied via SEM, XRD, and photoelectrochemistry. The potential dependence of photocurrent and the photocurrent transients indicate that the nanocomposite shows characteristics of n-type semiconductor. The experimental results demonstrate that the PCNF/TiO2 shows a higher photoelectrochemical response and sensitivity for visible light illumination than FCNF/TiO2 and pristine TiO2. This is likely because of the specific microstructure of the PCNF, which possesses large numbers of active edge sites and provides many favorable sites for electron transfer as well as a very large working surface area. The significant enhancement of the photoelectrochemical response of the CNF toward visible light responses may result from the difference of their morphologies as well as their textural properties and crystalline structure. The results show that PCNF and FCNF are thus very promising candidates for developing a class of ideal and novel modified photoelectrodes.

Key words: TiO2 nanocomposite electrodes, Carbon nanofibers, Photoelectrochemistry, IPCE

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