Статья

Pd-Pt Bimetallic Nanodendrites with High Activity for Oxygen Reduction

Byungkwon LimDepartment of Biomedical Engineering, Washington University, St. Louis, MO 63130, USAMajiong JiangDepartment of Chemistry, Washington University, St. Louis, MO 63130, USAPedro H. C. CamargoDepartment of Biomedical Engineering, Washington University, St. Louis, MO 63130, USAEun Chul ChoDepartment of Biomedical Engineering, Washington University, St. Louis, MO 63130, USAJing TaoCondensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USAXianmao LuDepartment of Biomedical Engineering, Washington University, St. Louis, MO 63130, USAYimei ZhuCondensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USAYounan XiaDepartment of Biomedical Engineering, Washington University, St. Louis, MO 63130, USA

2009en

ABI

Аннотация

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.

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Идентификаторы

DOI: 10.1126/science.1170377

Цитирования и источники

Цитирований: 3Использованных источников: 0

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