Supported Ru-Pt Bimetallic Nanoparticle Catalysts Prepared by Atomic Layer Deposition

被引：188
|
作者：
Christensen, Steven T. [1 ]
Feng, Hao [1 ]
Libera, Joseph L. [1 ]
Guo, Neng [1 ]
Miller, Jeffrey T. [1 ]
Stair, Peter C. [1 ,2 ]
Elam, Jeffrey W. [1 ]
机构：
[1] Argonne Natl Lab, Argonne, IL 60439 USA
[2] Northwestern Univ, Dept Chem, Evanston, IL 60208 USA
来源：
NANO LETTERS | 2010年 / 10卷 / 08期
关键词：
Atomic layer deposition; platinum; ruthenium; bimetallic catalysts; THIN-FILMS; OXIDATION; PLATINUM; PALLADIUM; ALUMINA; GROWTH; SIZE; GAS; IR;
D O I：
10.1021/nl101567m
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Atomic layer deposition (ALD) is used to deposit ruthenium-platinum nanostructured catalysts using 2,4-(dimethylpentadienyl)(ethylcyclopentadienyl) ruthenium, trimethyl(methylcyclopentadienyl) platinum, and oxygen as precursors. Transmission electron microscopy shows discrete 1.2 nm nanoparticles decorating the surface of the spherical alumina support. The Ru-Pt particles are crystalline and have a crystal structure similar to pure platinum. X-ray fluorescence measurements show that the nanoparticle composition is controlled by the ratio of metal precursor ALD cycles. X-ray absorption spectroscopy at the Ru K-edge indicates a nearest neighbor Ru-Pt interaction consistent with a bimetallic composition. Methanol decomposition reactions further confirm a Ru-Pt interaction and show enhanced methanol conversion for the bimetallic nanoparticles when compared to catalysts comprised of a mixture of pure Pt and Ru nanoparticles of similar loading. These results demonstrate that ALD is a viable technique for synthesizing mixed-metal nanostructures suitable for catalysis and other applications.
引用
收藏
页码：3047 / 3051
页数：5
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