由铜欠电位沉积合成的 Pt@Cu 核壳树枝状纳米粒子的特性研究。

Characterization of Pt@Cu core@shell dendrimer-encapsulated nanoparticles synthesized by Cu underpotential deposition.

机构信息

Department of Chemistry and Biochemistry, Center for Electrochemistry, and the Texas Materials Institute, The University of Texas at Austin, 1 University Station, A5300, Austin, Texas 78712-0165, United States.

出版信息

Langmuir. 2011 Apr 5;27(7):4227-35. doi: 10.1021/la2001915. Epub 2011 Mar 8.

DOI:10.1021/la2001915

PMID:21384847

Abstract

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.

摘要

用玻璃碳电极固定的平均含有 55、147 和 225 个 Pt 原子的树枝状聚合物包被纳米粒子（DENs）作为欠电位沉积（UPD）Cu 单层的电活性表面。这导致形成核@壳（Pt@Cu）DENs。这一结论的证据来自循环伏安法，它表明 Pt 核 DENs 在 Cu UPD 之前催化析氢反应，但在 Cu UPD 之后，该反应被抑制。通过原位电化学 X 射线吸收光谱（XAS）得到的结果证实了这一发现。