催化作用
纳米颗粒
分散性
纳米结构
材料科学
电催化剂
铂金
价(化学)
纳米技术
铂纳米粒子
贵金属
纳米晶
化学工程
金属
化学
物理化学
电化学
电极
有机化学
冶金
工程类
高分子化学
作者
Guirong Zhang,Dan Zhao,Yuanyuan Feng,Bingsen Zhang,Dang Sheng Su,Gang Liu,Bo‐Qing Xu
出处
期刊:ACS Nano
[American Chemical Society]
日期:2012-02-10
卷期号:6 (3): 2226-2236
被引量:170
摘要
Platinum is a widely used precious metal in many catalytic nanostructures. Engineering the surface electronic structure of Pt-containing bi- or multimetallic nanostructure to enhance both the intrinsic activity and dispersion of Pt has remained a challenge. By constructing Pt-on-Au (Pt∧Au) nanostructures using a series of monodisperse Au nanoparticles in the size range of 2–14 nm, we disclose herein a new approach to steadily change both properties of Pt in electrocatalysis with downsizing of the Au nanoparticles. A combined tuning of Pt dispersion and its surface electronic structure is shown as a consequence of the changes in the size and valence-band structure of Au, which leads to significantly enhanced Pt mass-activity on the small Au nanoparticles. Fully dispersed Pt entities on the smallest Au nanoparticles (2 nm) exhibit the highest mass-activity to date towards formic acid electrooxidation, being 2 orders of magnitude (75–300 folds) higher than conventional Pt/C catalyst. Fundamental relationships correlating the Pt intrinsic activity in Pt∧Au nanostructures with the experimentally determined surface electronic structures (d-band center energies) of the Pt entities and their underlying Au nanoparticles are established.
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