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Findings from School of Science Provides New Data on Chalcogens (Evaluating the Mechanism of Visible Light Activity for N,F-TiO2 Using...

July 22, 2014



Findings from School of Science Provides New Data on Chalcogens (Evaluating the Mechanism of Visible Light Activity for N,F-TiO2 Using Photoelectrochemistry)

By a News Reporter-Staff News Editor at Life Science Weekly -- Researchers detail new data in Chalcogens. According to news reporting originating from Sligo, Ireland, by NewsRx correspondents, research stated, "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."

Our news editors obtained a quote from the research from the School of Science, "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 titania, then any additional visible light activity may give an overall improvement in the solar efficiency."

According to the news editors, the research concluded: "The photocurrent response should not be used as a direct measure of photocatalytic activity for doped titania as the oxygen reduction pathway is vitally important for the generation of ROS, whereas hole transfer from dopant midgap states may not be so critical."

For more information on this research see: Evaluating the Mechanism of Visible Light Activity for N,F-TiO2 Using Photoelectrochemistry. Journal of Physical Chemistry C, 2014;118(23):12206-12215. Journal of Physical Chemistry C can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Journal of Physical Chemistry C - www.pubs.acs.org/journal/jpccck)

The news editors report that additional information may be obtained by contacting J.W.J. Hamilton, Inst Technol Sligo, Sch Sci, Dept. of Environm Sci, Sligo, Ireland. Additional authors for this research include J.A. Byrne, P.S.M. Dunlop, D.D. Dionysiou, M. Pelaez, K. O'Shea, D. Synnott and S.C. Pillai (see also Chalcogens).

Keywords for this news article include: Sligo, Europe, Ireland, Chalcogens, Photocatalyst, Nanotechnology, Photocatalytic, Emerging Technologies

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Life Science Weekly


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