24 August 2010 Electrochemical and photocatalytic properties of TiO2/WO3 photoelectrodes
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Abstract
Porous films of TiO2 and TiO2/WO3 were deposited onto transparent electrodes from aqueous suspensions with polyethylene glycol, TiO2 particles and different amounts of tungistic acid. After annealing, crystalline samples were obtained. The band gap energy, approximately 3.1 eV for TiO2, decreased from 2.9 to 2.7 eV for varying W/Ti molar ratios from 3 to 12 %. The electrochemical properties were investigated in Na2SO4 aqueous solution; for the TiO2 electrode, the open circuit potential changed from 0.18 V in the dark to -0.25 V under irradiation from a solar simulator. For hybrid TiO2/WO3 electrodes, the VOC values were almost independent of the WO3 content and corresponded to 0.3 V in the dark and -0.1 V under irradiation; however, photocurrent and interfacial capacitance increased with a higher WO3 concentration. The electrodes were then used as photocatalysts for 17-α-etinylestradiol removal from water, and the mixed TiO2/WO3 exhibited better performance for photocatalytic oxidation of estradiol than TiO2. Adding WO3 enhances the visible light harvesting and minimizes the charge recombination resulting in higher efficiency for solar energy conversion.
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Haroldo G. Oliveira, Erika D. Silva, Claudia Longo, "Electrochemical and photocatalytic properties of TiO2/WO3 photoelectrodes", Proc. SPIE 7770, Solar Hydrogen and Nanotechnology V, 777006 (24 August 2010); doi: 10.1117/12.860804; https://doi.org/10.1117/12.860804
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