Etching approach to hybrid structures of PtPd nanocages and graphene for efficient oxygen reduction reaction catalysts
Etching approach to hybrid structures of PtPd nanocages and graphene for efficient oxygen reduction reaction catalysts
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用于高效氧还原反应催化剂的 PtPd 纳米笼和石墨烯混合结构的蚀刻方法
DOI：
10.1007/s12274-015-0770-6
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发表时间：
2015-09-01
期刊：
影响因子：
9.9
通讯作者：
Xiong, Yujie
中科院分区：
文献类型：
--
作者：
Bai, Song;Wang, Chengming;Xiong, Yujie
阴极氧还原反应（ORR）是可再生能源技术中非常重要的电化学反应。一般来说，催化剂的表面积、暴露面和电导率在决定其电催化活性方面都起着重要作用，而其性能耐久性可以通过与支撑材料的集成来提高。在这项工作中，我们开发了一种合成 PtPd 双金属纳米笼和石墨烯之间的混合结构的方法，通过在还原氧化石墨烯 (rGO) 支撑的 Pd 纳米立方体上选择性外延生长单晶 Pt 壳，然后进行 Pd 蚀刻。 PtPd 纳米笼的中空性质、{100} 表面刻面和双金属成分，加上石墨烯良好的导电性和稳定性，使得 ORR 中具有高电催化性能。所得PtPd纳米笼-rGO结构的质量活度（0.534 A·mgPt−1）和比活度（0.482 mA·cm−2）分别是Pt/C相应值的4.4倍和3.9倍。
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·mgPt−1) and specific activity (0.482 mA·cm−2) which are 4.4 times and 3.9 times greater than the corresponding values for Pt/C.