Preparation of mesoporous NiO with a bimodal pore size distribution and application in electrochemical capacitors

被引:157
作者
Wang, Dengchao [1 ]
Ni, Wenbin [1 ]
Pang, Huan [1 ]
Lu, Qingyi [1 ]
Huang, Zhongjie [1 ]
Zhao, Jianwei [1 ]
机构
[1] Nanjing Univ, Sch Chem & Chem Engn, Key Lab Analyt Chem Life Sci MOE, Nanjing 210008, Peoples R China
基金
中国国家自然科学基金;
关键词
Nickel oxide; Mesoporous; Bimodal pore size distribution; Metal-organic coordination precursor; Electrochemical capacitors; NICKEL-OXIDE; ACTIVATED CARBONS; PERFORMANCE; MANGANESE; ELECTRODE;
D O I
10.1016/j.electacta.2010.05.084
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Mesoporous nickel oxide with a porous structure exhibiting a bimodal pore size distribution (2.6 and 30.3 nm diameter pores) has been synthesized in this paper. Firstly, a mesoporous precursor of coordination complex Ni-3(btc)(2)center dot 12H(2)O (btc = 1,3,5-benzenrtricarboxylic acid) is synthesized based on the metal-organic coordination mechanism by a hydrothermal method. Then mesoporous NiO with a bimodal size distribution is obtained by calcining the precursor in the air, and characterized by transmission electron microscopy and N-2 adsorption measurements. Such unique multiple porous structure indicates a promising application of the obtained NiO as electrode materials for supercapacitors. The electrochemical behavior has been investigated by cyclic voltammogram, electrochemical impedance spectra and chronopotentiometry in 3 wt.% KOH aqueous electrolyte. The results reveal that the prepared NiO has high-capacitance retention at high scan rate and exhibits excellent cycle-life stability due to its special mesoporous character with bimodal size distribution. (c) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码:6830 / 6835
页数:6
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