Hierarchical Network Architectures of Carbon Fiber Paper Supported Cobalt Oxide Nanonet for High-Capacity Pseudocapacitors

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• 作者：Lei Yang ; Shuang Cheng ; Yong Ding ; Xingbao Zhu ; Zhong Lin Wang ; Meilin Liu
• 刊名：Nano Letters
• 出版年：2012
• 出版时间：January 11, 2012
• 年：2012
• 卷：12
• 期：1
• 页码：321-325
• 全文大小：294K
• 年卷期：v.12,no.1(January 11, 2012)
• ISSN：1530-6992

文摘

We present a high-capacity pseudocapacitor based on a hierarchical network architecture consisting of Co₃O₄ nanowire network (nanonet) coated on a carbon fiber paper. With this tailored architecture, the electrode shows ideal capacitive behavior (rectangular shape of cyclic voltammograms) and large specific capacitance (1124 F/g) at high charge/discharge rate (25.34 A/g), still retaining 94% of the capacitance at a much lower rate of 0.25 A/g. The much-improved capacity, rate capability, and cycling stability may be attributed to the unique hierarchical network structures, which improves electron/ion transport, enhances the kinetics of redox reactions, and facilitates facile stress relaxation during cycling.

Keywords:

Pseudocapacitor; hierarchical network architecture; carbon fiber paper; rate capability