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Citation: Yu-Qiao Wang, Xue-Ling Gao, Bo Song, Yun-Liang Gu, Yue-Ming Sun. Photoelectrochemical properties of MWCNT-TiO2 hybrid materials as a counter electrode for dye-sensitized solar cells[J]. Chinese Chemical Letters, ;2014, 25(4): 491-495. doi: 10.1016/j.cclet.2014.01.003 shu

Photoelectrochemical properties of MWCNT-TiO2 hybrid materials as a counter electrode for dye-sensitized solar cells

  • 1.

    a School of Chemistry & Chemical Engineering, Southeast University, Nanjing 211189, China;

  • 2.

    b Jiangsu Optoelectronic Functional Materials & Engineering Laboratory, Nanjing 211189, China

  • Corresponding author: Yu-Qiao Wang,  Yue-Ming Sun, 
  • Received Date: 24 October 2013
    Available Online: 26 December 2013

    Fund Project: We are grateful for the grants from the National Natural Science Foundation of China (No. 21173042) (No. 21173042) National Basic Research Program of China (No. 2013CB932902) (No. 2013CB932902) Fundamental Research Funds for the Central Universities (No. 3207043401) (No. 3207043401) Science & Technology Support Project of Jiangsu (No. BE2013118) (No. BE2013118)

  • The MWCNT-TiO2 hybrid materials were prepared by a simply mixing method and used as a counter electrode (CE) for dye-sensitized solar cells. Compared with the platinum CE, MWCNT-TiO2 CE has the similar redox voltage and current response in the cyclic voltammetry. The electrochemical catalytic activity was characterized by the electrochemical impedance spectroscopy and Tafel curve, including the equivalent circuit, the exchange current density, the limiting diffusion current density, and the diffusion coefficient of triiodide/iodide redox species. The results indicate that the reduction process from triiodide to iodide is determined by the kinetic-controlled and diffusion-limited processes. The device performance is optimal based on the MWCNT-TiO2 (mass ratio of 2:1) CE, such as the open-circuit voltage of 0.72 V, the short-circuit photocurrent density of 15.71 mA/cm2, the fill factor of 0.68, and the photon-to-electron conversion efficiency of 7.69%.
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