Pt@Au Nanorods Uniformly Decorated on Pyridyne Cycloaddition Graphene as a Highly Effective Electrocatalyst for Oxygen Reduction
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- 作者：Xing Zhong ; Huiyou Yu ; Xinde Wang ; Lin Liu ; Yu Jiang ; Lei Wang ; Guilin Zhuang ; Youqun Chu ; Xiaonian Li ; Jian-guo Wang
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2014
- 出版时间：August 27, 2014
- 年：2014
- 卷：6
- 期：16
- 页码：13448-13454
- 全文大小：473K
- ISSN：1944-8252
文摘
Preparing metal-supported graphene nanocomposites is both interesting and challenging because of their well-defined morphologies and have potential application for oxygen reduction reaction (ORR). Here, we present an easy approach to synthesizing a novel hybrid material composed of Pt@Au nanorods (NRs) uniformly dispersed on the pyridyne cycloaddition of graphene (Pt@Au-PyNG), and the material serves as a high-performance catalyst for ORR. This hybrid electrocatalyst significantly decreases the use of Pt by using Pt dispersed on Au NRs and shows a markedly high activity toward ORR. The resulting Pt@Au-PyNG hybrid displayed comparable electrocatalytic activity and better stability than commercial Pt/C in alkaline solutions toward ORR. The hybrid effectively blocks CO formation to increase catalyst resistance to CO poisoning, thereby decreasing the amount of Pt needed. Free-energy diagrams for ORR on Pt@Au (111) through dissociative and associative mechanisms show that OH or O hydrogenation is the rate-limiting step based on DFT calculations.