High-Quality Metal Oxide Core/Shell Nanowire Arrays on Conductive Substrates for Electrochemical Energy Storage
High-Quality Metal Oxide Core/Shell Nanowire Arrays on Conductive Substrates for Electrochemical Energy Storage
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DOI：
10.1021/nn301454q
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发表时间：
2012-06-01
期刊：
影响因子：
17.1
通讯作者：
Fan, Hong Jin
中科院分区：
文献类型：
--
作者：
Xia, Xinhui;Tu, Jiangping;Fan, Hong Jin
赝电容器电极的高性能在很大程度上依赖于纳米结构的精细设计和定制活性材料的智能混合。我们提出了一个强大的两步溶液为基础的方法，用于制造过渡金属助剂核/壳纳米结构阵列在各种导电基板上。示范的例子包括Co 3 O 4或ZnO纳米线芯和NiO纳米片壳与分层和多孔形态。提出了“定向附着”和“自组装”晶体生长机制来解释NiO纳米片壳的形成。对基于三维大孔泡沫镍上Co 3 O 4/NiO纳米线阵列的超级电容器电极进行了全面表征。由于独特的多孔核/壳纳米线阵列结构和两种电化学活性材料的合理组合，电极在6000次循环后在2 A/g下表现出853 F/g的高比电容和优异的循环稳定性。我们的生长方法为过渡金属氧化物或氢氧化物分级纳米阵列的设计和合成提供了一种新技术，这些纳米阵列有望用于电化学储能，催化和气体传感应用。
The high performance of a pseudocapacitor electrode relies largely on a scrupulous design of nanoarchitectures and smart hybridization of bespoke active materials. We present a powerful two-step solution-based method for the fabrication of transition metal aide core/shell nanostructure arrays on various conductive substrates. Demonstrated examples include Co3O4 or ZnO nanowire core and NiO nanoflake shells with a hierarchical and porous morphology. The "oriented attachment" and "self-assembly' crystal growth mechanisms are proposed to explain the formation of the NiO nanoflake shell. Supercapacitor electrodes based on the Co3O4/NiO nanowire arrays on 3D macroporous nickel foam are thoroughly characterized. The electrodes exhibit a high specific capacitance of 853 F/g at 2 A/g after 6000 cycles and an excellent cycling stability, owing to the unique porous core/shell nanowire array architecture, and a rational combination of two electrochemically active materials. Our growth approach offers a new technique for the design and synthesis of transition metal oxide or hydroxide hierarchical nanoarrays that are promising for electrochemical energy storage, catalysis, and gas sensing applications.