Journal of Electrochemical Science and Technology

The Korean Electrochemical Society (한국전기화학회)
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Improved Tri-iodide Reduction Reaction of Co-TMPP/C as a Non-Pt Counter Electrode in Dye-Sensitized Solar Cells

  • Kim, Jy-Yeon (Department of Chemical and Environmental Engineering, Soongsil University) ;
  • Lee, Jin-Kyu (Department of Chemical and Environmental Engineering, Soongsil University) ;
  • Han, Sang-Beom (Department of Chemical and Environmental Engineering, Soongsil University) ;
  • Lee, Young-Woo (Department of Chemical and Environmental Engineering, Soongsil University) ;
  • Park, Kyung-Won (Department of Chemical and Environmental Engineering, Soongsil University)
  • Received : 2010.11.24
  • Accepted : 2010.12.28
  • Published : 2010.12.30
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Abstract

We report Co-tetramethoxyphenylporphyrin on carbon particles (Co-TMPP/C) as a non-Pt catalyst for tri-iodide reduction in dye-sensitized solar cells (DSSCs). The presence of well-dispersed carbon and cobalt source in the catalyst surface is confirmed by transmission electron microscopy, scanning electron microscopy, and energy dispersive X-ray analysis. In the C 1s, Co 2p, and N 1s peaks measured by X-ray photoelectron spectroscopy, the C-N, Co-$N_4$, and N-C are assigned to the component at 285.7, 781.8, and 401 eV, respectively. Especially, the Co-TMPP/C shows improved current density, diffusion coefficient, and charge-transfer resistance in the ${I_3}^-/I^-$ redox reaction compared to conventional catalysts. Furthermore, in the DSSCs performance, the Co-TMPP/C shows increased short circuit current density, higher open circuit voltage, and improved cell efficieny in comparison with Pt/C.

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