Co3O4/Ni(OH)2 composite mesoporous nanosheet networks as a promising electrode for supercapacitor applications
Co3O4/Ni(OH)2 composite mesoporous nanosheet networks as a promising electrode for supercapacitor applications
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DOI：
10.1039/c2jm15863a
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发表时间：
2012-02
影响因子：
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通讯作者：
Jin-Hui Zhong;An‐Liang Wang;Gao‐Ren Li;Jian-wei Wang;Y. Ou;Y. Tong
中科院分区：
文献类型：
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作者：
Jin-Hui Zhong;An‐Liang Wang;Gao‐Ren Li;Jian-wei Wang;Y. Ou;Y. Tong
采用电化学沉积法在Ti基体上制备了Co（OH）2/Ni（OH）2介孔纳米片网络（NNs），通过热处理在导电基体上制备了Co 3 O 4/Ni（OH）2复合介孔纳米片网络（NNs）。采用X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线光电子能谱（XPS）、傅里叶变换红外光谱（FT-IR）和显微拉曼光谱（Raman）对样品进行了表征。将上述产物直接官能化为超级电容器电极，而不使用任何辅助材料如炭黑或粘合剂。Co 3 O 4/Ni（OH）2复合介孔NN在5 mV s-1下实现了1144 F g-1的高比电容（Csp）和长期循环能力。电化学测试结果表明，Co 3 O 4/Ni（OH）2复合介孔神经网络具有比单一Co 3 O 4或Ni（OH）2更好的电化学性能。Ni 2 +/Ni 3+和Co2+/Co 3+的二元氧化还原电对、具有多孔结构的纳米片网络、纳米片内的介孔结构、纳米片之间的互连以及与集流体（基底）的良好电接触是Co 3 O 4/Ni（OH）2复合介孔NN电化学性能提高的原因。由于易于大规模制备和上级电化学特性，在Ti衬底上生长的Co 3 O 4/Ni（OH）2复合介孔纳米网络将是超级电容器应用的良好候选者。
Co3O4/Ni(OH)2 composite mesoporous nanosheet networks (NNs) grown on conductive substrates were synthesized by heat treatment of Co(OH)2/Ni(OH)2 NNs that were synthesized on Ti substrates by a facile electrochemical deposition route. The prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), and micro-Raman spectroscopy. The above products were directly functionalized as supercapacitor electrodes without using any ancillary materials such as carbon black or binder. Co3O4/Ni(OH)2 composite mesoporous NNs achieved a high specific capacitance (Csp) of 1144 F g−1 at 5 mV s−1 and long-term cyclability. The electrochemical measurements showed Co3O4/Ni(OH)2 composite mesoporous NNs exhibited much better electrochemical performances than single Co3O4 or Ni(OH)2. The binary redox couples of Ni2+/Ni3+ and Co2+/Co3+, nanosheet networks with porous structures, the mesoporous structure within nanosheets, the interconnections among nanosheets, together with the excellent electrical contact with the current collector (substrate) are responsible for the improved electrochemical performances of Co3O4/Ni(OH)2 composite mesoporous NNs. With the ease of large scale fabrication and superior electrochemical characteristics, Co3O4/Ni(OH)2 composite mesoporous NNs grown on Ti substrates will be good candidates for supercapacitor applications.