title: Efficient CO Oxidation Using Dendrimer-Encapsulated Pt Nanoparticles Activated with <2% Cu Surface Atoms.
abstract: In this paper, we show that the onset potential for CO oxidation electrocatalyzed by ∼2 nm dendrimer-encapsulated Pt nanoparticles (Pt DENs) is shifted negative by ∼300 mV in the presence of a small percentage (<2%) of Cu surface atoms. Theory and experiments suggest that the catalytic enhancement arises from a cocatalytic Langmuir-Hinshelwood mechanism in which the small number of Cu atoms selectively adsorb OH, thereby facilitating reaction with CO adsorbed to the dominant Pt surface. Theory suggests that these Cu atoms are present primarily on the (100) facets of the Pt DENs.
authors: Department of Chemistry, ‡Institute for Computational and Engineering Sciences, and §Texas Materials Institute, The University of Texas at Austin , 105 East 24th Street, Stop A5300, Austin, Texas 78712-1224, United States.
authors: Long
authors: L
authors: Luo
authors: Department of Chemistry, ‡Institute for Computational and Engineering Sciences, and §Texas Materials Institute, The University of Texas at Austin , 105 East 24th Street, Stop A5300, Austin, Texas 78712-1224, United States.
authors: Liang
authors: L
authors: Zhang
authors: Department of Chemistry, ‡Institute for Computational and Engineering Sciences, and §Texas Materials Institute, The University of Texas at Austin , 105 East 24th Street, Stop A5300, Austin, Texas 78712-1224, United States.
authors: Zhiyao
authors: Z
authors: Duan
authors: Department of Chemistry, ‡Institute for Computational and Engineering Sciences, and §Texas Materials Institute, The University of Texas at Austin , 105 East 24th Street, Stop A5300, Austin, Texas 78712-1224, United States.
authors: Aliya S
authors: AS
authors: Lapp
authors: Department of Chemistry, ‡Institute for Computational and Engineering Sciences, and §Texas Materials Institute, The University of Texas at Austin , 105 East 24th Street, Stop A5300, Austin, Texas 78712-1224, United States.
authors: Graeme
authors: G
authors: Henkelman
authors: Department of Chemistry, ‡Institute for Computational and Engineering Sciences, and §Texas Materials Institute, The University of Texas at Austin , 105 East 24th Street, Stop A5300, Austin, Texas 78712-1224, United States.
authors: Richard M
authors: RM
authors: Crooks
keywords: CO electro-oxidation; bimetallic nanoparticle; density functional theory; isolated Cu