Evaluating the Mechanism of Visible Light Activity for N,F-TiO2 Using Photoelectrochemistry
| Autor: | Damian W. Synnott, Suresh C. Pillai, John Byrne, Jwj Hamilton, Kevin E. O'Shea, Psm Dunlop, Miguel Pelaez, Dionysios D. Dionysiou |
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| Rok vydání: | 2014 |
| Předmět: |
Absorption spectroscopy
Band gap Photoelectrochemistry 02 engineering and technology 010402 general chemistry Photochemistry 01 natural sciences 7. Clean energy chemistry.chemical_compound Physical and Theoretical Chemistry Photocurrent business.industry Singlet oxygen 021001 nanoscience & nanotechnology 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy Solar cell efficiency chemistry 13. Climate action Photocatalysis Optoelectronics 0210 nano-technology business Visible spectrum |
| Zdroj: | The Journal of Physical Chemistry C. 118:12206-12215 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | The improvement of the solar efficiency of photocatalytic materials is important for solar driven environmental remediation and solar energy harvesting applications. Photoelectrochemical characterization of nitrogen and fluorine codoped titanium dioxide (N,F-TiO2) was used to probe the mechanism of visible light activity. The spectral photocurrent response under visible irradiation did not correlate with the optical absorption spectrum of the N,F-TiO2; however, open-circuit photopotential measurements provided better correlation to the optical absorption spectra. These observations suggest that electrons excited to the conduction band from the N-induced midgap state are rapidly trapped by defect levels below the conduction band. Reactive oxygen species (ROS) can be produced via the reduction of molecular oxygen by conduction band electrons leading to the oxidative degradation of organic pollutants, and singlet oxygen may play a role. If there is no loss in the band gap activity, as compared to undoped tit... |
| Databáze: | OpenAIRE |
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