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 language | English |
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Article number | 1700250 |
Number of pages | 8 |
Journal | Particle & particle systems characterization |
Volume | 35 |
Issue number | 1 |
Early online date | 10 Oct 2017 |
DOIs | |
Publication status | Published - Jan 2018 |
Keywords
- Nanoparticle engineering
- Photocatalysis
- Photodeposition
- Platinum
- WO
- platinum
- nanoparticle engineering
- photocatalysis
- photodeposition
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