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Au–Pd Alloy and Core–Shell Nanostructures: One-Pot Coreduction Preparation, Formation Mechanism, and Electrochemical Properties

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journal contribution
posted on 08.05.2012, 00:00 by Long Kuai, Xue Yu, Shaozhen Wang, Yan Sang, Baoyou Geng
It is a known fact that Pd-based bimetallic nanostructures possess unique properties and excellent catalytic performance. In this work, the Au–Pd alloy and core–shell 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–Pd bimetallic nanostructures. CTAB plays a key role in the formation of alloy Au–Pd nanostructures. When CTAB is absent, the products are typical core–shell nanostructures. Moreover, the as-prepared nanostructures exhibit excellent electrocatalytic ORR performance in alkaline media, especially for Au–Pd 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–shell 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.