Watching nanoparticles grow : the mechanism and kinetics for the formation of TiO{sub 2}-supported platinum nanoparticles.

Journal Article · Wed Nov 14 00:00:00 EST 2007 · J. Am. Chem. Soc.

DOI:https://doi.org/10.1021/ja076437p· OSTI ID:939327

Chupas, P J; Chapman, K W; Jennings, G; Lee, P L; Grey, C P

The formation of supported Pt nanoparticles during the reduction of Pt{sup 4+} on TiO{sub 2} under H{sub 2} (4% in He) gas flow has been monitored using a differential approach to time-resolved pair distribution function (PDF) analysis of high-energy X-ray scattering data. The reduction of Pt{sup 4+} species was found to follow pseudo-zero-order reaction kinetics, with an activation energy of 0.52 eV. Reaction data obtained at constant temperature (100, 150, and 200 C) and during heating (0-200 C) indicate that the growth of nanoparticles from the reduce Pt{sup 0} species depends strongly on temperature and proceeds more rapidly upon heating.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC02-06CH11357
• OSTI ID: 939327
• Report Number(s): ANL/XSD/JA-60089; JACSAT; TRN: US200823%%14
• Journal Information: J. Am. Chem. Soc., Vol. 129, Issue 45 ; Nov. 14, 2007; ISSN 0002-7863
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
PLATINUM
NANOSTRUCTURES
TITANIUM OXIDES
SUBSTRATES
SYNTHESIS
MONITORING
ACTIVATION ENERGY
CHEMICAL REACTION KINETICS
CRYSTAL GROWTH