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Related Experiment Videos

Ag(+)-inserted NbO(2)F as a Novel Photocatalyst.

Takashi Murase1, Hiroshi Irie, Kazuhito Hashimoto

  • 1Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, Japan.

The Journal of Physical Chemistry. B
|July 21, 2006
PubMed
Summary

Silver (Ag) insertion into niobium oxyfluoride (NbO(2)F) narrowed its band gap, enhancing photocatalytic activity for 2-propanol decomposition under visible and UV light.

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Area of Science:

  • Materials Science
  • Photocatalysis
  • Semiconductor Physics

Background:

  • Niobium oxyfluoride (NbO(2)F) is a semiconductor material with potential photocatalytic applications.
  • Modifying semiconductor band gaps is crucial for optimizing light absorption and photocatalytic efficiency.

Purpose of the Study:

  • To investigate the effect of silver (Ag(+)) insertion on the electronic structure and photocatalytic activity of NbO(2)F.
  • To evaluate the photocatalytic performance of Ag-NbO(2)F for the decomposition of 2-propanol (IPA).

Main Methods:

  • Synthesis of Ag-NbO(2)F composite material.
  • Characterization of band gap narrowing and light absorption properties.
  • Photocatalytic decomposition of gaseous IPA under different light irradiations (400-530 nm and 300-400 nm).

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  • Density of states calculations to understand electronic structure.

    • Main Results:

    • Ag(+) insertion narrowed the band gap of NbO(2)F from 3.2 eV to 3.0 eV, shifting light absorption to the near-violet region.
    • Ag-NbO(2)F demonstrated photocatalytic activity in decomposing IPA to CO(2) via acetone under both visible (400-530 nm) and UV (300-400 nm) light.
    • Similar quantum efficiencies under both irradiation conditions indicated effective utilization of visible light.
    • Density of states calculations confirmed complete hybridization of Ag4d and O2p orbitals, responsible for visible light sensitivity.

    Conclusions:

    • Silver doping effectively enhances the photocatalytic performance of NbO(2)F by narrowing the band gap and enabling visible light absorption.
    • The observed visible light activity is attributed to the strong hybridization between Ag 4d and O 2p orbitals.
    • Ag-NbO(2)F shows promise as an efficient photocatalyst for environmental applications using visible light sources.