Etching approach to hybrid structures of PtPd nanocages and graphene for efficient oxygen reduction reaction catalysts

查看全文 作　　者：Song [1]Bai;Chengming [1]Wang;Wenya [1]Jiang;Nana [1]Du;Jing [1]Li;Junteng [1]Du;Ran [1]Long;Zhengquan [2]Li;Yujie [1]Xiong

机构地区：[1]Hefei National Laboratory for Physical Sciences at the Microscale, Collaborative Innovation Center of Chemistry for Energy Materials, School of Chemistry and Materials Science, Laboratory of Engineering and Material Science, and National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, China;[2]Department of Materials Physics, Zhejiang Normal University, Jinhua, Zhejiang 321004, China

出　　处：《Nano Research》索引2015年第8卷第9期,共11页

摘　　要：Cathodic oxygen reduction reaction (ORR) is a highly important electrochemical reaction in renewable-energy technologies. In general, the surface area, exposed facets and electrical conductivity of catalysts all play important roles in determining their electrocatalytic activities, while their performance durability can be improved by integration with supporting materials. In this work we have developed a method to synthesize hybrid structures between PtPd bimetallic nanocages and graphene by employing selective epitaxial growth of single-crystal Pt shells on Pd nanocubes supported on reduced graphene oxide (rGO), followed by Pd etching. The hollow nature, {100} surface facets and bimetallic composition of PtPd nanocages, together with the good conductivity and stability of graphene, enable high electrocatalytic performance in ORR. The obtained PtPd nanocage-rGO structures exhibit mass activity (0.534 A.m-1) and which are 4.4 times and 3.9 times greater than the specific activity (0.482 mA-cm-2) corresponding values for Pt/C. 关键词：platinum,nanocage,oxygen reduction reaction,electrocatalysis,graphene

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Etching approach to hybrid structures of PtPd nanocages and graphene for efficient oxygen reduction reaction catalysts

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