title: High sintering resistance of platinum nanoparticles embedded in a microporous hollow carbon shell fabricated through a photocatalytic reaction.
abstract: Platinum (Pt) nanoparticles encapsulated in microporous carbon with a hollow structure (nPt@hC) were fabricated on the basis of a titanium(IV) oxide (TiO2) photocatalytic reaction. From the tomogram of a sample studied by using a transmission electron microscope (TEM), the Pt nanoparticles were found to be embedded in the carbon shell and were physically separated from each other by the carbon matrix. Owing to this unique structure, the Pt particles showed high resistance to sintering when subjected to thermal treatment at temperatures up to 800 degrees C. As a result, hydrogenation reactions using various heat-treated nPt@hCs as catalysts indicated that loss of catalytic activity was minimized. Thus, the present system will be a promising system for optimizing catalyst nanostructures utilized in processes requiring rigorous conditions.
authors.affiliation: Research Center for Solar Energy Chemistry, Osaka University, 1-3 Machikaneyama, Toyonaka 560-8531, Japan.
authors.forename: Yun Hau
authors.initials: YH
authors.lastname: Ng
authors.forename: Shigeru
authors.initials: S
authors.lastname: Ikeda
authors.forename: Takashi
authors.initials: T
authors.lastname: Harada
authors.forename: Takao
authors.initials: T
authors.lastname: Sakata
authors.forename: Hirotaro
authors.initials: H
authors.lastname: Mori
authors.forename: Akio
authors.initials: A
authors.lastname: Takaoka
authors.forename: Michio
authors.initials: M
authors.lastname: Matsumura