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Visible light sensitive photocatalyst, delafossite structured alpha-AgGaO(2).

Yoshihiko Maruyama1, Hiroshi Irie, Kazuhito Hashimoto

  • 1Department of Applied Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

The Journal of Physical Chemistry. B
|November 17, 2006
PubMed
Summary

Synthesized alpha-AgGaO(2) powder effectively decomposes 2-propanol using visible or UV light. This delafossite material exhibits photocatalytic activity due to its 2.4 eV band gap and dispersed valence band.

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Area of Science:

  • Materials Science
  • Photocatalysis
  • Inorganic Chemistry

Background:

  • Delafossite structured AgGaO(2) is a semiconductor material with potential photocatalytic applications.
  • Polymorphism in AgGaO(2) can significantly influence its electronic and photocatalytic properties.

Purpose of the Study:

  • To synthesize and characterize delafossite structured alpha-AgGaO(2) powder.
  • To investigate the photocatalytic activity of alpha-AgGaO(2) for 2-propanol decomposition under UV and visible light irradiation.
  • To compare the photocatalytic performance of alpha-AgGaO(2) with its polymorph, alpha-AgGaO(2).

Main Methods:

  • Cation exchange reaction for the synthesis of alpha-AgGaO(2) powder.
  • UV-Vis spectroscopy to determine the band gap energy.

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  • Photocatalytic decomposition of 2-propanol under controlled irradiation conditions.
  • First-principle calculations to analyze electronic band structure.

    • Main Results:

    • Successfully synthesized delafossite structured alpha-AgGaO(2) with a band gap of 2.4 eV, absorbing visible light up to 520 nm.
    • alpha-AgGaO(2) effectively decomposed 2-propanol to CO2 via acetone under UV (300-400 nm) and visible light (420-530 nm).
    • Quantum efficiency of alpha-AgGaO(2) was consistent across UV and visible light, decreasing for wavelengths >530 nm, supporting the 2.4 eV band gap. The polymorph alpha-AgGaO(2) (2.1 eV band gap) showed negligible activity.
    • First-principle calculations revealed a more dispersed valence band in alpha-AgGaO(2) compared to alpha-AgGaO(2), facilitating hole conduction.

    Conclusions:

    • The delafossite structured alpha-AgGaO(2) exhibits significant photocatalytic activity for 2-propanol decomposition, driven by its suitable band gap and electronic structure.
    • The superior photocatalytic performance of alpha-AgGaO(2) is attributed to its larger band gap and more dispersed valence band, enhancing hole mobility.
    • This study highlights the importance of crystal structure and electronic band properties in designing efficient photocatalysts for environmental applications.