纳米团簇
催化作用
铂金
粒径
材料科学
纳米颗粒
纳米技术
色散(光学)
簇大小
化学工程
化学物理
氧还原反应
基质(水族馆)
粒子(生态学)
星团(航天器)
氧气
氧还原
化学
计算化学
物理化学
电子结构
电化学
物理
计算机科学
有机化学
电极
光学
海洋学
地质学
工程类
程序设计语言
作者
Markus Nesselberger,Melanie Röefzaad,Fayçal Riad Hamou,P. Ulrich Biedermann,Florian F. Schweinberger,Sebastian Kunz,Katrin Schloegl,Gustav K. H. Wiberg,Sean Ashton,Ueli Heiz,Karl Johann Jakob Mayrhofer,Matthias Arenz
出处
期刊:Nature Materials
[Springer Nature]
日期:2013-07-21
卷期号:12 (10): 919-924
被引量:324
摘要
The diminished surface-area-normalized catalytic activity of highly dispersed Pt nanoparticles compared with bulk Pt is particularly intricate, and not yet understood. Here we report on the oxygen reduction reaction (ORR) activity of well-defined, size-selected Pt nanoclusters; a unique approach that allows precise control of both the cluster size and coverage, independently. Our investigations reveal that size-selected Pt nanoclusters can reach extraordinarily high ORR activities, especially in terms of mass-normalized activity, if deposited at high coverage on a glassy carbon substrate. It is observed that the Pt cluster coverage, and hence the interparticle distance, decisively influence the observed catalytic activity and that closely packed assemblies of Pt clusters approach the surface activity of bulk Pt. Our results open up new strategies for the design of catalyst materials that circumvent the detrimental dispersion effect, and may eventually allow the full electrocatalytic potential of Pt nanoclusters to be realized.
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