Photoelectrochromic devices based on WO3-MoO3 and TiO2/CdS composite electrodes
WO3-MoO3 thin films were prepared by hydrothermal method using conductive glass as substrate,and their electrochromic properties were analyzed by cyclic voltammetry,chronocoulometry,chronoamperometry and electrochemical impedance spectroscopy.Meanwhile,TiO2/CdS composite thin films were synthesized by hydrothermal method combined with continuous ion layer deposition,and their photoelectric conversion properties were tested by linear cyclic voltammetry,transient photocurrent and transmittance.WO3-MoO3 thin film and TiO2/CdS composite thin film with the best performance were then used as color-changing cathode and photoanode respectively to construct WO3/MoO3-TiO2/CdS photoelectrochromic device.The results showed that,compared with WO3-TiO2/CdS device,WO3/MoO3-TiO2/CdS photoelectrochromic device exhibited larger optical modulation range(41.99%at 630 nm),higher coloring efficiency(35.787 cm2/C),and its photoelectric conversion efficiency(0.126%)was 2.38 times that of WO3-TiO2/CdS device(0.053%).
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