Abstract
Fe3O4-reduced graphene oxide (Fe3O4-RGO) binder-free counter electrode (CE) is prepared by using an easy and low-cost electrophoretic deposition method and controlling the hydrogen evolution process followed by an electrochemical reduction process for dye-sensitized solar cell (DSSC). X-ray diffraction, X-ray photoelectron spectroscopy, energy dispersive spectrometer, Raman spectroscopy, field emission scanning electron microscopy, and transmission electron microscopy (TEM) indicate clearly the formation of Fe3O4-RGO nanocomposite. TEM images show that the Fe3O4 nanoparticles with diameters in the range of 10–30 nm are uniformly deposited on RGO. The layer-by-layer deposition of iron oxide species anchored on graphene nanosheets during the EPD on FTO provides a unique film for DSSC. To evaluate the chemical catalysis and stability of prepared CEs toward I3 − reduction and the interfacial charge transfer properties, Fe3O4-RGO nanocomposite and RGO are characterized by cyclic voltammetry, Tafel polarization, and electrochemical impedance spectroscopy. Under AM 1.5 irradiation (100 mW cm−2), the DSSC based on the Fe3O4-RGO shows a power conversion efficiency of 5.91%, which is comparable with the Pt CE, suggesting that the Fe3O4-RGO nanocomposite is an effective CE material for low-cost DSSC. The proposed approach can prepare a thin film of Fe3O4-RGO at short time with suitable performance in DSSC.
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Ghasemi, S., Hosseini, S.R. & Kazemi, Z. Electrophoretic preparation of graphene-iron oxide nanocomposite as an efficient Pt-free counter electrode for dye-sensitized solar cell. J Solid State Electrochem 22, 245–253 (2018). https://doi.org/10.1007/s10008-017-3741-x
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DOI: https://doi.org/10.1007/s10008-017-3741-x