Synthesis of CoSe2/RGO Composites and Its Application as a Counter Electrode for Dye-Sensitized Solar Cells

Yohan Ko, Wooyeol Choi, Youbin Kim, Chanyong Lee, Yongseok Jun, Junhee Kim
2019 Journal of Electrochemical Science and Technology  
In this study, cobalt diselenide (CoSe 2 ) and the composites (CoSe2@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
more » ... t 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%).
doi:10.33961/jecst.2019.00052 fatcat:lw74ab2povgsxjjf77eo6byi5e