The Effect of Methanol on the Photodeposition of Pt Nanoparticles on Tungsten Oxide

Kasper Wenderich, Kai Han, Guido Mul* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

10 Citations (Scopus)
2 Downloads (Pure)

Abstract

Formation of platinum nanoparticles on tungsten oxide by photodeposition from acidic [PtCl6]2- solutions in the absence or presence of methanol is studied in detail. Without methanol, [PtCl6]2--ions adsorbed on the WO3 surface are converted to highly dispersed PtO/Pt(OH)2 particles upon illumination, the maximum achievable amount being limited to 10-30% of [PtCl6]2- present in solution. Inclusion of methanol not only promotes adsorption of [PtCl6]2- ions, but upon illumination results in a deposited Pt quantity close to 100% of [PtCl6]2-. The obtained Pt particles are in the metallic state, large, and often clustered. The limited loading and presence of PtO/Pt(OH)2 in the absence of methanol is explained by reduction of WO3-surface sites, accompanied by water oxidation catalyzed by PtO/Pt(OH)2 deposits. The extensive reduction of Pt in methanol solutions is likely induced by methoxy-radicals, oxidatively formed by reaction of methanol with photogenerated holes. This study provides guidelines for optimization of synthesis procedures of Pt/WO3 (photo)catalysts.

Original languageEnglish
Article number1700250
Number of pages8
JournalParticle & particle systems characterization
Volume35
Issue number1
Early online date10 Oct 2017
DOIs
Publication statusPublished - Jan 2018

Keywords

  • Nanoparticle engineering
  • Photocatalysis
  • Photodeposition
  • Platinum
  • WO
  • platinum
  • nanoparticle engineering
  • photocatalysis
  • photodeposition

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