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Improved photoelectrical performance of graphene supported highly crystallized anatase TiO2

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Abstract

In this study, titanium oxysulfate (TiOSO4) and graphene were used as titanium source and supporter, respectively, to synthesize anatase TiO2-graphene (TiO2-G) composite. Crystal structure, morphology, and composition of TiO2-G were investigated by X-ray diffraction, scanning electron microscope, transmission electron microscope, and thermogravimetric analysis. Both TiO2-G and blank TiO2 powders exhibit spindle-shaped structure with the long axis along [001]. Compared to unsupported TiO2, TiO2 nanoparticles uniformly formed on graphene surface. When fabricated into dye-sensitized solar cells, photoelectrical conversion efficiency of TiO2-G (2.3 %) was much higher than that of blank TiO2 (0.89 %) prepared at the same conditions. Moreover, high sintering temperature enhanced photoelectrical performance of the composite. When the temperature was increased from 450 to 600 °C, the efficiency was improved from 1.5 to 2.6 %. The findings above demonstrate that TiO2-G has great potential for applications in dye-sensitized solar cells.

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Acknowledgments

This work was partially supported by the National Natural Science Foundation of China (51402161, 51172113, and 51373086), the China Postdoctoral Science Foundation (2013T60652 & 2012M521297), the International Science and Technology Cooperation Program of China (2014DFA60150), the Research Fund for the Doctoral Program of Higher Education of China (20123719110001), the Taishan Overseas Scholar Program, the Shandong Postdoctoral Innovative Program (201203028), and the Qingdao Applied Basic Research Project (14-2-4-51-jch).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042, People’s Republic of China

    Min Zhang, Qiong Sun, Mei Zhao, Yang Li, Qiuhong Liu & Lifeng Dong

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  1. Min Zhang
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  2. Qiong Sun
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  3. Mei Zhao
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  4. Yang Li
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  5. Qiuhong Liu
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  6. Lifeng Dong
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Correspondence to Lifeng Dong.

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Zhang, M., Sun, Q., Zhao, M. et al. Improved photoelectrical performance of graphene supported highly crystallized anatase TiO2 . Appl. Phys. A 120, 595–600 (2015). https://doi.org/10.1007/s00339-015-9221-1

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