Morphological and Interfacial Control of Platinum Nanostructures for Electrocatalytic Oxygen Reduction

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• 作者：Guang-Rui Xu ; Bin Wang ; Jing-Yi Zhu ; Feng-Yi Liu ; Yu Chen ; Jing-Hui Zeng ; Jia-Xing Jiang ; Zong-Huai Liu ; Ya-Wen Tang ; Jong-Min Lee
• 刊名：ACS Catalysis
• 出版年：2016
• 出版时间：August 5, 2016
• 年：2016
• 卷：6
• 期：8
• 页码：5260-5267
• 全文大小：601K
• 年卷期：0
• ISSN：2155-5435

文摘

The catalytic performance of noble metal nanocrystals highly depends on their surface structure and interface structure. Effective surface/interface control over noble metal nanocrystals can significantly improve their electrocatalytic activity, durability, and selectivity for the various important electrochemical reactions in low-temperature polymer electrolyte fuel cells. In this work, the polyallylamine (PAA)-functionalized Pt nanostructures with long-spined sea-urchin-like morphology (Pt-LSSUs@PAA) have been synthesized successfully through a simple chemical reduction route. The high branching degree of Pt-LSSUs@PAA nanostructures and the sheet morphology of the branches effectively improve the utilization of the Pt metal. The particular 3D interconnected architecture of Pt-LSSUs@PAA nanostructures significantly enhances the electrochemical stability. Loose-packed PAA layers on the surface of Pt-LSSUs@PAA nanostructures efficiently modify the electronic property of Pt atoms and serve as barrier networks to restrain the accessibility of alcohol molecules. As a result, the as-prepared Pt-LSSUs@PAA nanostructures show high activity, excellent durability, and particular alcohol tolerance for the oxygen reduction reaction in acidic media.