Photoelectrochemical and photocatalytic properties of nanocrystalline TiO2 electrodes

Haroldo G. Oliveira; Daiane C. Nery; Matheus P. Paschoalino; Wilson F. Jardim; Claudia Longo

doi:10.1117/12.734419

11 September 2007 Photoelectrochemical and photocatalytic properties of nanocrystalline TiO₂ electrodes

Haroldo G. Oliveira, Daiane C. Nery, Matheus P. Paschoalino, Wilson F. Jardim, Claudia Longo

Proceedings Volume 6650, Solar Hydrogen and Nanotechnology II; 66500T (2007) https://doi.org/10.1117/12.734419
Event: Solar Energy + Applications, 2007, San Diego, California, United States

Abstract

The electrochemical and photocatalytic properties of a TiO₂ film deposited on transparent electrodes were investigated. Its electrochemical behavior was typical of an n-type semiconductor electrode. Its photocatalytic activity, investigated for phenol degradation on an optical bench (area of 1 cm², 5 mL of solution), revealed small currents (3 μA) and poor total organic carbon (TOC) removal (5 %) when the electrode was biased at + 1.1 V in the dark for 3 h. Under polychromatic irradiation, the electrode presented 25 μA of current and 12 % of phenol degradation. A better performance was achieved for photoelectrocatalytic configuration, when the electrode was irradiated and biased with + 0.6 V. Experiments done under irradiation with a metallic vapor lamp using 9 cm² electrodes and 10 mL of solution revealed that heterogeneous photocatalysis configuration (HPC) resulted in 50 % of TOC removal, while 85 % was achieved by the electro-assisted process (EHPC). Both the configurations exhibited pseudo-first order kinetics for phenol degradation, but the rate constant was two times that of EHPC. The application of a potential bias to the TiO₂ porous electrode must enhance the photogenerated electron/hole separation, which minimize the charge recombination and increases its photocatalytic activity towards organic pollutant degradation.

Citation Download Citation

Haroldo G. Oliveira, Daiane C. Nery, Matheus P. Paschoalino, Wilson F. Jardim, and Claudia Longo "Photoelectrochemical and photocatalytic properties of nanocrystalline TiO₂ electrodes", Proc. SPIE 6650, Solar Hydrogen and Nanotechnology II, 66500T (11 September 2007); https://doi.org/10.1117/12.734419

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