Amine-Assisted Synthesis of Concave Polyhedral Platinum Nanocrystals Having {411} High-Index Facets

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• 作者：Xiaoqing Huang ; Zipeng Zhao ; Jingmin Fan ; Yueming Tan ; Nanfeng Zheng
• 刊名：Journal of the American Chemical Society
• 出版年：2011
• 出版时间：April 6, 2011
• 年：2011
• 卷：133
• 期：13
• 页码：4718-4721
• 全文大小：775K
• 年卷期：v.133,no.13(April 6, 2011)
• ISSN：1520-5126

文摘

High-index surfaces of a face-centered cubic metal (e.g., Pd, Pt) have a high density of low-coordinated surface atoms and therefore possess enhanced catalysis activity in comparison with low-index faces. However, because of their high surface energy, the challenge of chemically preparing metal nanocrystals having high-index facets remains. We demonstrate in this work that introducing amines as the surface controller allows concave Pt nanocrystals having {411} high-index facets to be prepared through a facile wet-chemical route. The as-prepared Pt nanocrystals display a unique octapod morphology with {411} facets. The presence of high-index {411} exposed facets endows the concave Pt nanocrystals with excellent electrocatalytic activity in the oxidation of both formic acid and ethanol.