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Role of Pt Nanoparticles in Photoreactions on TiO2 Photoelectrodes

Published online by Cambridge University Press:  28 August 2012

Woo-Jin An ,
Wei-Ning Wang ,
Balavinayagam Ramalingam ,
Somik Mukherjee ,
Dariusz M. Niedzwiedzki ,
Shubhra Gangopadhyay  and
Pratim Biswas
Woo-Jin An
Affiliation:
Aerosol and Air Quality Research Laboratory, Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, One Brookings Drive, Campus Box 1180, St. Louis, MO 63130, U.S.A.
Wei-Ning Wang
Affiliation:
Aerosol and Air Quality Research Laboratory, Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, One Brookings Drive, Campus Box 1180, St. Louis, MO 63130, U.S.A.
Balavinayagam Ramalingam
Affiliation:
Center for Micro/Nano Systems & Nanotechnology, University of Missouri, Columbia, MO 65211, U.S.A.
Somik Mukherjee
Affiliation:
Center for Micro/Nano Systems & Nanotechnology, University of Missouri, Columbia, MO 65211, U.S.A.
Dariusz M. Niedzwiedzki
Affiliation:
Photosynthetic Antenna Research Center (PARC), Washington University in St. Louis, One Brookings Drive, St. Louis, MO 63130, U.S.A.
Shubhra Gangopadhyay
Affiliation:
Center for Micro/Nano Systems & Nanotechnology, University of Missouri, Columbia, MO 65211, U.S.A.
Pratim Biswas
Affiliation:
Aerosol and Air Quality Research Laboratory, Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, One Brookings Drive, Campus Box 1180, St. Louis, MO 63130, U.S.A.
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Abstract

Highly efficient Pt-TiO2 composite photoelectrodes were synthesized by combining two novel deposition methods: ACVD and a room temperature RF (radio frequency) magnetron sputtering method. A room temperature RF magnetron sputtering method allowed uniform deposition of Pt nanoparticles (NPs) onto the as-synthesized nanostructured columnar TiO2 films by ACVD. Pt NP sizes from 0.5 to 3 nm demonstrating a high particle density (>1012 cm−2) could be achieved by varying deposition time with constant pressure and power intensity. As-synthesized Pt-TiO2 films were used as photoanodes for water photolysis. Pt nanoparticles deposited onto the TiO2 film for 20s produced the highest photocurrent (7.92 mA/cm2 to 9.49 mA/cm2) and maximized the energy conversion efficiency (16.2 % to 21.2 %) under UV illumination. However, as the size of Pt particles increased, more trapping sites for photogenerated electron-hole pairs decreased photoreaction.

Keywords

nanostructurethin filmphotochemical
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1446: Symposium U – Materials for Catalysis in Energy , 2012 , mrss12-1446-u09-35
Copyright
Copyright © Materials Research Society 2012

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References

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