Hierarchical 3D Mesoporous Conch-like Co3O4 Nanostructure Arrays for High-Performance Supercapacitors
Hierarchical 3D Mesoporous Conch-like Co3O4 Nanostructure Arrays for High-Performance Supercapacitors
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DOI：
10.1016/j.electacta.2014.07.074
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发表时间：
2014-09
影响因子：
6.6
通讯作者：
K. Qiu;Hailong Yan;Deyang Zhang;Yang Lu;Jinbing Cheng;Wanlong Zhao;Chunlei Wang;Yihe Zhang
中科院分区：
文献类型：
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作者：
K. Qiu;Hailong Yan;Deyang Zhang;Yang Lu;Jinbing Cheng;Wanlong Zhao;Chunlei Wang;Yihe Zhang
采用水热法和后退火法在泡沫镍衬底上制备了厚度为几纳米的层次化介孔类Co3O4纳米阵列。这种高度有序的三维(3D)纳米结构提供了许多优点，这归功于所需的大孔率特性，包括增强了电解液流动的质量传输，从而降低了器件电阻并加快了反应动力学。这种独特的纳米结构具有出色的电化学性能，具有高容量和理想的循环寿命。当评估为超级电容器的电极材料时，Co3O4纳米结构阵列(NCA)电极能够在5 mA/cm−2的电流密度下提供4.11F cm−2的高面电容。该电极还表现出优异的循环稳定性，在5000次充放电循环后仍保持93%的最大电容。本文提出的制作策略简单、成本低，可为大规模储能器件的应用提供一条新的途径。
Hierarchical mesoporous conch-like Co3O4nanostructure arrays with the thickness of a few nanometers supported on Ni foam substrate have been fabricated by a hydrothermal approach together with a post-annealing treatment. The highly ordered three-dimensional (3D) nanostructure offers numerous advantages duo to the desired properties of macroporosity, including enhanced mass transport for the electrolyte flow, thereby reducing the device resistance and faster the reaction kinetics. Such unique nanoarchitecture exhibits remarkable electrochemical performance with high capacitance and desirable cycle life. When evaluate as an electrode material for supercapacitors, the Co3O4nanostructure arrays (NCAs) electrode is able to deliver high areal capacitance of 4.11 F cm−2at a current density of 5 mA cm−2in 2 M NaOH aqueous solution. The electrode also exhibits excellent cycling stability by retaining 93% of the maximum capacitance after 5000 charge-discharge cycles. The fabrication strategy presented here is facile, cost-effective, and can offer a new pathway for large-scale energy storage device applications.