Compressed hydrogen gas-induced synthesis of Au–Pt core–shell nanoparticle chains towards high-performance catalysts for Li–O2 batteries
Compressed hydrogen gas-induced synthesis of Au–Pt core–shell nanoparticle chains towards high-performance catalysts for Li–O2 batteries
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DOI：
10.1039/c4ta01475h
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发表时间：
2014-06
影响因子：
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通讯作者：
C. Li;Wenyu Zhang;H. Ang;Hong Yu;B.Y. Xia;X. Wang;Y. Yang;Yang Zhao;H. Hng;Q. Yan
中科院分区：
文献类型：
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作者：
C. Li;Wenyu Zhang;H. Ang;Hong Yu;B.Y. Xia;X. Wang;Y. Yang;Yang Zhao;H. Hng;Q. Yan
本文报道了一种不使用任何表面活性剂的两步法制备金铂核壳纳米颗粒链的绿色合成方法。在合成过程中，压缩氢作为还原剂，也促进了颗粒链的组装。制备的单分散金纳米粒子在高压下被偶极子操纵形成链状纳米结构；同时，Pt壳在金纳米链上发生原位外延生长，形成Au-Pt核壳纳米颗粒链。所制备的Au-Pt核壳双金属链在锂氧电池中表现出优异的阴极催化活性，由于其清洁的催化表面、相互连接的纳米结构提供了良好的电子路径和先天的协同效应，具有较低的充放电过电位和优异的循环性能。
Herein we reported a green synthetic route for the preparation of Au–Pt core–shell nanoparticle chains in a two-step route without the use of any surfactants. In the synthesis, compressed hydrogen was used as a reducing reagent, which also promoted the assembly of particle chains. The as-prepared monodispersed gold nanoparticles were manipulated by dipoles to form chain-like nanostructures under high pressure; meanwhile, in situ epitaxial growth of Pt shell on gold nanochains occurred, leading to the formation of Au–Pt core–shell nanoparticle chains. The resulting bimetallic Au–Pt core–shell chains showed excellent catalytic activity as cathodes in lithium oxygen batteries with a low charge–discharge over potential and outstanding cycle performance because of its clean catalytic surface, interconnected nanostructure, which provided a good electron path and innate synergistic effect.