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2005 63 Vol. 63, 2005 7 , 658662 ACTA CHIMICA SINICA No. 7, 658662 · · Pt/Al O CO 2 3 * ( 730000) Pt/Al O (110 nm), CO Pt 2 3 . (TEM), (SEM), (CV), Pt , . ; Pt/Al O ; ; 2 3 Particle Size Effect of Alumina-supported Platinum Catalysts Syn- thesized by Microemulsion on the Electrocatalytic Oxidation of CO GENG, Dong-Sheng LÜ, Gong-Xuan* BI, Yu-Shui BI, Ying-Pu (State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000) Abstract Alumina-supported Pt catalysts, the sizes of which were between one and ten nanometer, were synthesized by water-in-oil microemulsion method. The effect of the Pt particle size on the electrocatalytic oxidation of CO was studied in detail. Transmission electron microscopy (TEM), scanning electron micro- graph (SEM) and cyclic voltammetry (CV) were used for the characterization of the catalysts. It has been found that the catalytic activity obviously depended on the size of Pt nanoparticle, and the range of the op- timum particle size was 56 nm, which may result from the number of adsorption sites and the relative coverages of COad and OHad species. Keywords microemulsion; Pt/Al O ; nanoparticle; size effect 2 3 , 110 nm , [1] 112 nm Pt/C , 1.24.5 nm , Pt , ,
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