title: Pd-Pt bimetallic nanodendrites with high activity for oxygen reduction.
abstract: Controlling the morphology of Pt nanostructures can provide a great opportunity to improve their catalytic properties and increase their activity on a mass basis. We synthesized Pd-Pt bimetallic nanodendrites consisting of a dense array of Pt branches on a Pd core by reducing K2PtCl4 with L-ascorbic acid in the presence of uniform Pd nanocrystal seeds in an aqueous solution. The Pt branches supported on faceted Pd nanocrystals exhibited relatively large surface areas and particularly active facets toward the oxygen reduction reaction (ORR), the rate-determining step in a proton-exchange membrane fuel cell. The Pd-Pt nanodendrites were two and a half times more active on the basis of equivalent Pt mass for the ORR than the state-of-the-art Pt/C catalyst and five times more active than the first-generation supportless Pt-black catalyst.
authors.affiliation: Department of Biomedical Engineering, Washington University, St. Louis, MO 63130, USA.
authors.forename: Byungkwon
authors.initials: B
authors.lastname: Lim
authors.forename: Majiong
authors.initials: M
authors.lastname: Jiang
authors.forename: Pedro H C
authors.initials: PH
authors.lastname: Camargo
authors.forename: Eun Chul
authors.initials: EC
authors.lastname: Cho
authors.forename: Jing
authors.initials: J
authors.lastname: Tao
authors.forename: Xianmao
authors.initials: X
authors.lastname: Lu
authors.forename: Yimei
authors.initials: Y
authors.lastname: Zhu
authors.forename: Younan
authors.initials: Y
authors.lastname: Xia
mesh_terms: D002384:Catalysis; D004563:Electrochemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry*
chemical_list: D010984:Platinum; D010165:Palladium; D010100:Oxygen