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Investigating the effect of UV light pre-treatment on the oxygen activation capacity of Au/TiO2

Journal Article


Abstract


  • The potential for applying UV light pre-treatment to enhance the oxygen activation capacity of Au/TiO2

    under ambient conditions was examined. Catalytic formic acid oxidation in an aqueous environment was

    employed as the test reaction. Pre-illuminating Au/TiO2 with UV light can amplify the catalytic formic acid

    oxidation rate by up to four times with the degree of enhancement governed by system parameters such

    as Au loading, pre-illumination time, and initial formic acid loading. X-ray photoelectron spectroscopy,

    photoluminescence spectroscopy and electrochemical assessment of the Au/TiO2 indicated light preillumination

    invokes photoexcited electron transfer from the TiO2 support to the Au deposits. The Au deposits

    then utilise the additional electrons to catalyse molecular oxygen activation and promote the oxidation

    reaction. Scanning tunneling spectroscopy analysis and first principle calculations indicated the Au deposits

    introduced new electronic states above the TiO2 valence band. The new electronic states were most

    intense at the Au–TiO2 interface suggesting the Au deposit:TiO2 perimeter may be the key region for oxygen

    activation. The current study has demonstrated that pre-illuminating Au/TiO2 with light can be used to

    augment reactions where oxygen activation is a critical component, such as for the oxidation of organic

    pollutants and for the oxygen reduction reaction in fuel cells or energy storage systems.

UOW Authors


  •   Wong, Roong Jien. (external author)
  •   Dr Jason Scott, Jason (external author)
  •   Low, Gary K-C. (external author)
  •   Feng, Haifeng (external author)
  •   Du, Yi
  •   Hart, Judy N. (external author)
  •   Amal, Rose (external author)

Publication Date


  • 2016

Citation


  • Wong, R. Jien., Scott, J., Low, G. K-C., Feng, H., Du, Y., Hart, J. N. & Amal, R. (2016). Investigating the effect of UV light pre-treatment on the oxygen activation capacity of Au/TiO2. Catalysis Science & Technology, 6 (23), 8188-8199.

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2281

Number Of Pages


  • 11

Start Page


  • 8188

End Page


  • 8199

Volume


  • 6

Issue


  • 23

Abstract


  • The potential for applying UV light pre-treatment to enhance the oxygen activation capacity of Au/TiO2

    under ambient conditions was examined. Catalytic formic acid oxidation in an aqueous environment was

    employed as the test reaction. Pre-illuminating Au/TiO2 with UV light can amplify the catalytic formic acid

    oxidation rate by up to four times with the degree of enhancement governed by system parameters such

    as Au loading, pre-illumination time, and initial formic acid loading. X-ray photoelectron spectroscopy,

    photoluminescence spectroscopy and electrochemical assessment of the Au/TiO2 indicated light preillumination

    invokes photoexcited electron transfer from the TiO2 support to the Au deposits. The Au deposits

    then utilise the additional electrons to catalyse molecular oxygen activation and promote the oxidation

    reaction. Scanning tunneling spectroscopy analysis and first principle calculations indicated the Au deposits

    introduced new electronic states above the TiO2 valence band. The new electronic states were most

    intense at the Au–TiO2 interface suggesting the Au deposit:TiO2 perimeter may be the key region for oxygen

    activation. The current study has demonstrated that pre-illuminating Au/TiO2 with light can be used to

    augment reactions where oxygen activation is a critical component, such as for the oxidation of organic

    pollutants and for the oxygen reduction reaction in fuel cells or energy storage systems.

UOW Authors


  •   Wong, Roong Jien. (external author)
  •   Dr Jason Scott, Jason (external author)
  •   Low, Gary K-C. (external author)
  •   Feng, Haifeng (external author)
  •   Du, Yi
  •   Hart, Judy N. (external author)
  •   Amal, Rose (external author)

Publication Date


  • 2016

Citation


  • Wong, R. Jien., Scott, J., Low, G. K-C., Feng, H., Du, Y., Hart, J. N. & Amal, R. (2016). Investigating the effect of UV light pre-treatment on the oxygen activation capacity of Au/TiO2. Catalysis Science & Technology, 6 (23), 8188-8199.

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2281

Number Of Pages


  • 11

Start Page


  • 8188

End Page


  • 8199

Volume


  • 6

Issue


  • 23