Enhanced water photolysis with pt metal nanoparticles on single crystal TiO 2 surfaces

Woo Jin An, Wei Ning Wang, Balavinayagam Ramalingam, Somik Mukherjee, Batyrbek Daubayev, Shubhra Gangopadhyay, Pratim Biswas

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

Two novel deposition methods were used to synthesize Pt-TiO 2 composite photoelectrodes: a tilt-target room temperature sputtering method and aerosol-chemical vapor deposition (ACVD). Pt nanoparticles (NPs) were sequentially deposited by the tilt-target room temperature sputtering method onto the as-synthesized nanostructured columnar TiO 2 films by ACVD. By varying the sputtering time of Pt deposition, the size of deposited Pt NPs on the TiO 2 film could be precisely controlled. The as-synthesized composite photoelectrodes with different sizes of Pt NPs were characterized by various methods, such as SEM, EDS, TEM, XRD, and UV-vis. The photocurrent measurements revealed that the modification of the TiO 2 surface with Pt NPs improved the photoelectrochemical properties of electrodes. Performance of the Pt-TiO 2 composite photoelectrodes with sparsely deposited 1.15 nm Pt NPs was compared to the pristine TiO 2 photoelectrode with higher saturated photocurrents (7.92 mA/cm 2 to 9.49 mA/cm 2), enhanced photoconversion efficiency (16.2% to 21.2%), and increased fill factor (0.66 to 0.70). For larger size Pt NPs of 3.45 nm, the composite photoelectrode produced a lower photocurrent and reduced conversion efficiency compared to the pristine TiO 2 electrode. However, the surface modification by Pt NPs helped the composite electrode maintain higher fill factor values.

Original languageEnglish (US)
Pages (from-to)7528-7534
Number of pages7
JournalLangmuir
Volume28
Issue number19
DOIs
StatePublished - May 15 2012
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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