Journal of Electrochemical Science and Technology

The Korean Electrochemical Society (한국전기화학회)
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Synthesis of CoSe2/RGO Composites and Its Application as a Counter Electrode for Dye-Sensitized Solar Cells

  • Ko, Yohan (Graduate School of Energy and Environment (KU-KIST Green School), Korea University) ;
  • Choi, Wooyeol (Graduate School of Energy and Environment (KU-KIST Green School), Korea University) ;
  • Kim, Youbin (Graduate School of Energy and Environment (KU-KIST Green School), Korea University) ;
  • Lee, Chanyong (Graduate School of Energy and Environment (KU-KIST Green School), Korea University) ;
  • Jun, Yongseok (Graduate School of Energy and Environment (KU-KIST Green School), Korea University) ;
  • Kim, Junhee (Advanced Materials Component Research Center, Gumi Electronics & Information Technology Research Institute)
  • Received : 2019.04.05
  • Accepted : 2019.05.02
  • Published : 2019.09.30
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Abstract

In this study, cobalt diselenide ($CoSe_2$) and the composites ($CoSe_2@RGO$) of $CoSe_2$ and reduced graphene oxide (RGO) were synthesized by a facile hydrothermal reaction using cobalt ions and selenide source with or without graphene oxide (GO). The formation of $CoSe_2@RGO$ composites was identified by analysis with X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and scanning electron microscopy (SEM). Electrochemical analyses demonstrated that the $CoSe_2@RGO$ composites have excellent catalytic activity for the reduction of $I_3{^-}$, possibly indicating a synergetic effect of $CoSe_2$ and RGO. As a consequence, the $CoSe_2@RGO$ composites were applied as a counter electrode in DSSC for the reduction of redox couple electrolyte, and exhibiting the comparable power conversion efficiency (7.01%) to the rare metal platinum (Pt) based photovoltaic device (6.77%).

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