title: Deposition of platinum nanoparticles on carbon nanotubes by supercritical fluid method.
abstract: Carbon nanotube-supported platinum nanoparticles with a 5-15 nm diameter size range can be synthesized by hydrogen reduction of platinum(ll) acetylacetonate in methanol modified supercritical carbon dioxide. X-ray photoelectron spectroscopy and X-ray diffraction spectra indicate that the carbon nanotubes contain zero-valent platinum metal and high-resolution transmission electron microscopy images show that the visible lattice fringes of platinum nanoparticles are crystallites. Carbon nanotubes synthesized with 25% by weight of platinum nanoparticles exhibit a higher activity for hydrogenation of benzene compared with a commercial carbon black platinum catalyst. The carbon nanotube-supported platinum nanocatalyst can be reused at least six times for the hydrogenation reaction without losing activity. The carbon nanotube-supported platinum nanoparticles are also highly active for electrochemical oxidation of methanol and for reduction of oxygen suggesting their potential use as a new electrocatalyst for proton exchange membrane fuel cell applications.
authors.affiliation: Department of Chemistry, University of Idaho, Moscow, ID 83844, USA.
authors.forename: Clive H
authors.initials: CH
authors.lastname: Yen
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Cui
authors.forename: Horng-Bin
authors.initials: HB
authors.lastname: Pan
authors.forename: Shaofen
authors.initials: S
authors.lastname: Wang
authors.forename: Yuehe
authors.initials: Y
authors.lastname: Lin
authors.forename: Chien M
authors.initials: CM
authors.lastname: Wai
mesh_terms: D001554:Benzene / Q000737:chemistry; D002244:Carbon / Q000737:chemistry; D002384:Catalysis; D003460:Crystallization; D004563:Electrochemistry; D006859:Hydrogen / Q000737:chemistry; D000432:Methanol / Q000737:chemistry; D046529:Microscopy, Electron, Transmission; D008956:Models, Chemical; D049329:Nanostructures / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry; D010984:Platinum / Q000737:chemistry*; D013052:Spectrometry, X-Ray Emission; D014961:X-Ray Diffraction
chemical_list: D037742:Nanotubes, Carbon; D010984:Platinum; D002244:Carbon; D006859:Hydrogen; D001554:Benzene; D010100:Oxygen; D000432:Methanol