One-step in situ growth of Co9S8 on conductive substrate as an efficient counter electrode for dye-sensitized solar cells
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Cobalt sulfide counter electrodes for the dye-sensitized solar cell (DSSC) were successfully prepared on fluorine-doped tin oxide (FTO) glass substrates by a facial one-step in situ solvothermal method. The influences of prepared temperature on the synthesized phase, surface morphology, electrocatalytic, and photovoltaic performances of the cobalt sulfide counter electrodes were investigated with X-ray diffraction (XRD), field-emission scanning electron microscopy (SEM), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), Tafel, and photocurrent density–voltage (J–V) measurements. The results indicated that very thin Co9S8 nanoparticle thin films grew on the FTO substrates and the Co9S8 counter electrode prepared at 180 °C showed superior electrocatalytic activity, chemical stability, and photovoltaic performance. The DSSC based on the Co9S8 counter electrode prepared at 180 °C exhibited an efficiency of 6.59 % which was comparable to the solar cell based on the sputtering Pt counter electrode (6.82 %). It indicated that Co9S8 in situ growing on FTO glass substrate at 180 °C is a potential candidate to replace Pt as a low-cost and efficient counter electrode of DSSC.
KeywordsElectrochemical Impedance Spectroscopy Photovoltaic Performance High Electrocatalytic Activity Cobalt Sulfide Limit Diffusion Current Density
This work was supported by the Natural Science Foundation of Hubei Province (Grant No. 2015CFB513), the Research Foundation of Yichang Science and Technology Bureau, China (Grant No. A15-302-a10), Foundation of Key Laboratory of new building energy and building efficiency, Guangxi Province, China (Grant No. 15-J-22-2), and the Foundation of Key Laboratory for UV-Emitting Materials and Technology of Ministry of Education (Grant No. 130026504).
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Conflict of interest
All the authors declare that they have no conflict of interest.
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