Flexible Films Derived from Electrospun Carbon Nanofibers Incorporated with Co3O4 Hollow Nanoparticles as Self‐Supported Electrodes for Electrochemical Capacitors
Flexible Films Derived from Electrospun Carbon Nanofibers Incorporated with Co3O4 Hollow Nanoparticles as Self‐Supported Electrodes for Electrochemical Capacitors
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DOI：
10.1002/adfm.201203844
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发表时间：
2013-08
影响因子：
19
通讯作者：
Fang Zhang;C. Yuan;Jiajia Zhu;Jie Wang;Xiaogang Zhang;X. Lou
中科院分区：
文献类型：
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作者：
Fang Zhang;C. Yuan;Jiajia Zhu;Jie Wang;Xiaogang Zhang;X. Lou
柔性多孔薄膜由嵌入 Co3O4 中空纳米颗粒 (NP) 的电纺碳纳米纤维 (CNF) 制备而成，可直接用作高性能电化学电容器的自支撑电极。均匀的 Co3O4 空心纳米粒子良好地分散和/或嵌入到每个 CNF 中，具有理想的导电性。这些 Co3O4-CNF 相互交叉并形成 3D 分层多孔杂化膜。受益于有趣的结构特征，独特的无粘合剂Co3O4空心NPs/CNF混合薄膜电极表现出高比电容（SC）、优异的倍率性能和循环稳定性。例如，负载 35.9 wt% Co3O4 的柔性混合薄膜在 1 A g−1 的电流密度下可提供 556 F g−1 的 SC，甚至在 12 A g−1 的极高电流密度下也可提供 403 F g−1 的 SC。值得注意的是，在 4 A g−1 下连续充电/放电循环 2000 次后，SC 几乎没有衰减。这种卓越的电化学性能使得这种新型自支撑Co3O4-CNFs混合薄膜对高性能电化学电容器具有吸引力。
Flexible porous films are prepared from electrospun carbon nanofibers (CNFs) embedded with Co3O4 hollow nanoparticles (NPs) and are directly applied as self‐supported electrodes for high‐performance electrochemical capacitors. Uniform Co3O4 hollow NPs are well dispersed and/or embedded into each CNF with desirable electrical conductivity. These Co3O4‐CNFs intercross each other and form 3D hierarchical porous hybrid films. Benefiting from intriguing structural features, the unique binder‐free Co3O4 hollow NPs/CNF hybrid film electrodes exhibit high specific capacitance (SC), excellent rate capability and cycling stability. As an example, the flexible hybrid film with loading of 35.9 wt% Co3O4 delivers a SC of 556 F g−1 at a current density of 1 A g−1, and 403 F g−1 even at a very high current density of 12 A g−1. Remarkably, almost no decay in SC is found after continuous charge/discharge cycling for 2000 cycles at 4 A g−1. This exceptional electrochemical performance makes such novel self‐supported Co3O4‐CNFs hybrid films attractive for high‐performance electrochemical capacitors.