Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, USA.
J Am Chem Soc. 2010 Mar 10;132(9):3047-54. doi: 10.1021/ja909408q.
Steady-state electrochemical responses have been obtained at single Au nanoparticles using Pt nanoelectrodes. A Au single-nanoparticle electrode (SNPE) is constructed by chemically immobilizing a single Au nanoparticle at a SiO(2)-encapsulated Pt disk nanoelectrode, which was previously modified by an amine-terminated silane. The Au SNPE has been characterized by transmission electron microscopy, underpotential deposition of Cu, and steady-state cyclic voltammetry. It has been found that the presence of a single Au nanoparticle enhances the electron transfer from the Pt nanoelectrode to the redox molecules, and the voltammetric response at the Au SNPE depends on the size of the Au nanoparticle. The Au SNPE has been utilized to examine the oxygen-reduction reaction in a KOH solution to explore the feasibility of measuring the electrocatalytic activity at a single-nanoparticle level. It has been shown that the electrocatalytic activity of single Au nanoparticles can be directly measured using SNPEs, and the electrocatalytic activity is dependent on the size of the Au nanoparticles. This study can help to understand the structure-function relationship in nanoparticle-based electrocatalysis.
使用 Pt 纳米电极在单个 Au 纳米粒子上获得了稳态电化学响应。Au 单纳米粒子电极 (SNPE) 通过化学固定在 SiO2 封装的 Pt 盘纳米电极上的单个 Au 纳米粒子来构建，该纳米电极先前通过末端为胺的硅烷进行了修饰。通过透射电子显微镜、Cu 的欠电位沉积和稳态循环伏安法对 Au SNPE 进行了表征。已经发现，单个 Au 纳米粒子的存在增强了 Pt 纳米电极与氧化还原分子之间的电子转移，并且 Au SNPE 的伏安响应取决于 Au 纳米粒子的尺寸。Au SNPE 已被用于在 KOH 溶液中检查氧还原反应，以探索在单纳米粒子水平上测量电催化活性的可行性。已经表明，可以使用 SNPE 直接测量单个 Au 纳米粒子的电催化活性，并且电催化活性取决于 Au 纳米粒子的尺寸。这项研究有助于理解基于纳米粒子的电催化中的结构-功能关系。
