title: Electrocatalytic properties of hollow coral-like platinum mesocrystals.
abstract: Controlling the morphology and size of Pt nanostructures can provide a great opportunity to improve their electrocatalytic properties and durability toward methanol oxidation. We successfully synthesized well-defined hollow coral-like Pt mesocrystals via a facile replacement reaction, using hierarchically structured Ag nanoparticles as the template. The as-synthesized coral-like Pt mesocrystals had hollow structures composed of porous walls that were 5-7 nm thick, which were constructed from numerous pores (~2 nm) and small (~5 nm) Pt nanoparticle building units. These hollow and porous structures exhibited large electrochemical surface areas. The Pt mesostructures that have single-crystal inherence as well as hollow and porous features possess improved performance with respect to electrocatalytic activity (2.72 mA/cm(2) at peak potential, which is 2.1 times greater than that of Pt black) and durability toward methanol oxidation.
authors.affiliation: School of Science, MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Xi'an Jiaotong University, Shaan Xi 710049, PR China.
authors.forename: Tian
authors.initials: T
authors.lastname: Li
authors.forename: Hongjun
authors.initials: H
authors.lastname: You
authors.forename: Minwei
authors.initials: M
authors.lastname: Xu
authors.forename: Xiaoping
authors.initials: X
authors.lastname: Song
authors.forename: Jixiang
authors.initials: J
authors.lastname: Fang