Electrochemical and photocatalytic properties of TiO2/WO3 photoelectrodes

Haroldo G. Oliveira; Erika D. Silva; Claudia Longo

doi:10.1117/12.860804

24 August 2010 Electrochemical and photocatalytic properties of TiO₂/WO₃ photoelectrodes

Haroldo G. Oliveira, Erika D. Silva, Claudia Longo

Proceedings Volume 7770, Solar Hydrogen and Nanotechnology V; 777006 (2010) https://doi.org/10.1117/12.860804
Event: SPIE Solar Energy + Technology, 2010, San Diego, California, United States

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.

Citation Download Citation

Haroldo G. Oliveira, Erika D. Silva, and Claudia Longo "Electrochemical and photocatalytic properties of TiO₂/WO₃ photoelectrodes", Proc. SPIE 7770, Solar Hydrogen and Nanotechnology V, 777006 (24 August 2010); https://doi.org/10.1117/12.860804

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