Role of Pt nanoparticles in photoreactions on TiO 2 photoelectrodes

Woo Jin An, Wei Ning Wang, Balavinayagam Ramalingam, Somik Mukherjee, Dariusz M. Niedzwiedzki, Shubhra Gangopadhyay, Pratim Biswas

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Highly efficient Pt-TiO 2 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 TiO 2 films by ACVD. Pt NP sizes from 0.5 to 3 nm demonstrating a high particle density (>10 12 cm -2) could be achieved by varying deposition time with constant pressure and power intensity. As-synthesized Pt-TiO 2 films were used as photoanodes for water photolysis. Pt nanoparticles deposited onto the TiO 2 film for 20s produced the highest photocurrent (7.92 mA/cm 2 to 9.49 mA/cm 2) 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.

Original languageEnglish (US)
Title of host publicationMaterials for Catalysis in Energy
Pages71-75
Number of pages5
DOIs
StatePublished - 2012
Externally publishedYes
Event2012 MRS Spring Meeting - San Francisco, CA, United States
Duration: Apr 9 2012Apr 13 2012

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1446
ISSN (Print)0272-9172

Conference

Conference2012 MRS Spring Meeting
Country/TerritoryUnited States
CitySan Francisco, CA
Period4/9/124/13/12

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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