Characterization of Pt@Cu Core@Shell Dendrimer-Encapsulated Nanoparticles Synthesized by Cu Underpotential Deposition

被引：45

作者：

Carino, Emily V.

Crooks, Richard M. ^{[1
]}

机构：

[1] Univ Texas Austin, Dept Chem & Biochem, Ctr Electrochem, Austin, TX 78712 USA

来源：

LANGMUIR | 2011年 / 27卷 / 07期

基金：

美国国家科学基金会;

关键词：

GLASSY-CARBON ELECTRODES; SITU X-RAY; ALLOY ELECTROCATALYSTS; SURFACE; MONOLAYER; PLATINUM; COPPER; AU; REACTIVITY; REDUCTION;

D O I：

10.1021/la2001915

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Dendrimer-encapsulated nanoparticles (DENs) containing averages of 55, 147, and 225 Pt atoms immobilized on glassy carbon electrodes served as the electroactive surface for the underpotential deposition (UPD) of a Cu monolayer. This results in formation of core@shell (Pt@Cu) DENs. Evidence for this conclusion comes from cyclic voltammetry, which shows that the Pt core DENs catalyze the hydrogen evolution reaction before Cu UPD, but that after Cu UPD this reaction is inhibited. Results obtained by in situ electrochemical X-ray absorption spectroscopy (XAS) confirm this finding.

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页码：4227 / 4235

页数：9

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