Sol-gel template synthesis of highly ordered MnO2 nanowire arrays

被引:227
作者
Wang, XY [1 ]
Wang, XY [1 ]
Huang, WG
Sebastian, PJ
Gamboa, S
机构
[1] Xiangtan Univ, Chem Coll, Hunan 411105, Peoples R China
[2] Univ Nacl Autonoma Mexico, CIE, Solar Hydrogen Fuel Cell Grp, Temixco 62580, Morelos, Mexico
[3] CIMAV, Chihuahua 31109, Mexico
关键词
MnO2; nanowires; AAO template; sol-gel synthesis; supercapacitor;
D O I
10.1016/j.jpowsour.2004.07.033
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this paper, anodic aluminum oxide (AAO) templates with uniform pore diameter and periodicity were fabricated using a two-step oxidizating method at a constant current of 1.5 A dm(-2) in a mixed solution of 0.5 M sulfate acid and 5 g L-1 oxalic acid at room temperature, pore-widening was done in 5 wt.% phosphoric acid. Then, arrays of manganese dioxide nanowires were prepared by combining the AAO template and a sol-gel solution containing Mn(CH3COO)(2) and citric acid. SEM was used to characterize the structure of AAO and MnO2 nanowires. The results show that uniform length and diameter of MnO2 nanowires were obtained, and the length and diameter of MnO2 nanowires are dependent on the pore diameter and the thickness of the applied AAO template. The pore diameter of the AAO was about 70 nm, the diameter of the MnO2 nanowires was 70 nm and the length of the MnO2 nanowires was about 500-700 nm. XRD analysis indicate the MnO2 nanowires was alpha-MnO2 polymorph. The results of cyclic voltammetry indicated that the alpha-MnO2 nanowires are promising electrode materials for application in supercapacitors, the specific capacity of the electrode was 165 F g(-1). (C) 2004 Elsevier B.V. All rights reserved.
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页码:211 / 215
页数:5
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