Au鈥揚d Alloy and Core鈥揝hell Nanostructures: One-Pot Coreduction Preparation, Formation Mechanism, and Electrochemical Properties

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• 作者：Long Kuai ; Xue Yu ; Shaozhen Wang ; Yan Sang ; Baoyou Geng
• 刊名：Langmuir
• 出版年：2012
• 出版时间：May 8, 2012
• 年：2012
• 卷：28
• 期：18
• 页码：7168-7173
• 全文大小：314K
• 年卷期：v.28,no.18(May 8, 2012)
• ISSN：1520-5827

文摘

It is a known fact that Pd-based bimetallic nanostructures possess unique properties and excellent catalytic performance. In this work, the Au鈥揚d alloy and core鈥搒hell nanostructures have been prepared by a simple one-pot hydrothermal coreduction route, and their formation process and mechanism are discussed in detail. A reducing capacity-induced controlled reducing mechanism is proposed for the formation process of Au鈥揚d bimetallic nanostructures. CTAB plays a key role in the formation of alloy Au鈥揚d nanostructures. When CTAB is absent, the products are typical core鈥搒hell nanostructures. Moreover, the as-prepared nanostructures exhibit excellent electrocatalytic ORR performance in alkaline media, especially for Au鈥揚d alloy nanostructures. The overpotential of oxygen reduction gets reduced significantly, and the peak potential is positive-shifted by 44 and 34 mV in comparison with the core鈥搒hell ones and Pd/C catalyst, respectively. Thus, the controllable preparation and excellent electrocatalytic properties will make them become a potentially cheaper Pd-based cathodic electrocatalyst for DAFCs in alkaline media.