Fe-containing CeVO4 films as Li intercalation transparent counter-electrodes
نویسندگان
چکیده
Iron containing CeVO4 films were prepared using the sol–gel method. The crystalline structure of powders and films with Fe/Ce/V ratios of 0.1:1:1, 0.3:1:1 and 0.5:1:1 were investigated by X-ray diffraction (XRD) and infrared (IR) spectroscopy. XRD revealed the predominance of a CeVO4-W (wakefieldite) crystalline phase with a small amount of monoclinic CeVO4, CeO2 and Fe2O3. Ex situ IR absorbance spectra of charged and discharged films show the changes in intensity of the V–O stretching mode at 770 cm. Cyclic voltammetry showed that Li intercalation occurs in three steps with total capacities of 22 mC cm (Fe/Ce=0.1), 32 mC cm (Fe/Ce=0.3) and 37 mC cm (Fe/Ce=0.5). The increase in the overall charge capacity with increasing Fe content is accompanied by a loss of capacity with cycling. The lithium diffusion coefficient, calculated by the galvanostatic intermittent titration method (GITT), the potentiostatic intermittent titration method (PITT) and electrochemical impedance spectroscopy (EIS), ranges from 10 to 10 cm s. UV–vis in situ transmittance spectra showed that these films are highly transparent with a photopic transmittance TVis 0.85 for intercalated and deintercalated states. This suggests that Fe/Ce/V oxide films are good candidates for optically passive counter-electrodes in electrochromic (EC) devices. © 2001 Elsevier Science Ltd. All rights reserved.
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