Unique Activity of Platinum Adislands in the CO Electrooxidation Reaction

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• 作者：Dusan S. Strmcnik ; Dusan V. Tripkovic ; Dennis van der Vliet ; Kee-Chul Chang ; Vladimir Komanicky ; Hoydoo You ; Goran Karapetrov ; Jeffrey P. Greeley ; Vojislav R. Stamenkovic ; Nenad M. Marković
• 刊名：Journal of the American Chemical Society
• 出版年：2008
• 出版时间：November 19, 2008
• 年：2008
• 卷：130
• 期：46
• 页码：15332-15339
• 全文大小：436K
• 年卷期：v.130,no.46(November 19, 2008)
• ISSN：1520-5126

文摘

The development of electrocatalytic materials of enhanced activity and efficiency through careful manipulation, at the atomic scale, of the catalyst surface structure has long been a goal of electrochemists. To accomplish this ambitious objective, it would be necessary both to obtain a thorough understanding of the relationship between the atomic-level surface structure and the catalytic properties and to develop techniques to synthesize and stabilize desired active sites. In this contribution, we present a combined experimental and theoretical study in which we demonstrate how this approach can be used to develop novel, platinum-based electrocatalysts for the CO electrooxidation reaction in CO(g)-saturated solution; the catalysts show activities superior to any pure-metal catalysts previously known. We use a broad spectrum of electrochemical surface science techniques to synthesize and rigorously characterize the catalysts, which are composed of adisland-covered platinum surfaces, and we show that highly undercoordinated atoms on the adislands themselves are responsible for the remarkable activity of these materials.