A novel anode material of TiCl_4 treatment on Ag/TiO_2 in DSSC

摘要

Ag/TiO_2 anodes treated with TiCl_4 were prepared by sol and powder combination technology. Scanning electron microscope (SEM) shows that Ag/TiO_2 film is denser and has fewer gaps after TiCl_4 treatment. X-ray diffraction (XRD) indicates that the TiCl_4 treatment can significantly make the TiO_2 particle size become smaller on the electrode surface. Diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy associated with NH_3 adsorption confirms that the amount of anode surface acidity increase after TiCl_4 treatment. Electrochemical impedance spectroscopy (EIS) measurements show that the R_(ct2) corresponding to the TiO_2/dye/electrolyte interface decrease to 3.5 Ω. The TiCl_4 treatment can provide more specific binding sites to the alkaline dyes. Much more dyes can be adsorbed. Therefore, the photoelectric conversion efficiency of dye-sensitized solar cell (DSSC) was improved.