title: Preparation and characterization of platinum-ruthenium bimetallic nanoparticles using reverse microemulsions for fuel cell catalyst.
abstract: Platinum-ruthenium bimetallic nanoparticles are prepared by chemical reduction using sodium borohydride in reverse microemulsions of water/isooctane/Igepal CA-630/2-propanol for fuel cell catalysts. The prepared nanoparticles are characterized by transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and energy-dispersive X-ray analysis. The average size and morphology of nanoparticles are dependent on the water volume fraction in reverse microemulsion system in the range of ca. 2-4 nm. The morphology of particles is related with the percolation behavior of water droplets in reverse microemulsions. By the pretreatment of water phase using a hydrochloric acid, the particles of a homogeneous solid solution state can be obtained. The CO stripping cyclovoltammetry and the electrochemical measurements compared with commercial catalyst show that the prepared particles have a high electrochemically active surface area and a stable and high catalytic activity for reformate gas oxidation.
authors: Advanced Research Center for Energy and Environment, Musashi Institute of Technology, Tokyo, Japan.
authors: Taeyoon
authors: T
authors: Kim
authors: Koichi
authors: K
authors: Kobayashi
authors: Masayuki
authors: M
authors: Nagai
mesh_terms: D002384:Catalysis; D003902:Detergents / Q000737:chemistry; D004553:Electric Conductivity; D004563:Electrochemistry; D004655:Emulsions; D053768:Metal Nanoparticles / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D009795:Octanes / Q000737:chemistry; D017830:Octoxynol; D010084:Oxidation-Reduction; D010984:Platinum / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry; D012428:Ruthenium / Q000737:chemistry*; D013499:Surface Properties; D014867:Water
chemical_list: D003902:Detergents; D004655:Emulsions; D009795:Octanes; D014867:Water; D011092:Polyethylene Glycols; D010984:Platinum; D012428:Ruthenium; D017830:Octoxynol; C010615:Nonidet P-40; C045798:2,2,4-trimethylpentane