Sparse MnO2 nanowires clusters for high-performance supercapacitors

被引：19

作者：

Yuan, Y. F. ^{[1
]}

Pei, Y. B. ^{[1
]}

Guo, S. Y. ^{[1
]}

Fang, J. ^{[1
]}

Yang, J. L. ^{[1
]}

机构：

[1] Zhejiang Sci Tech Univ, Coll Machinery & Automat, Hangzhou 310018, Peoples R China

来源：

MATERIALS LETTERS | 2012年 / 73卷

关键词：

MnO2; Supercapacitor; Nanocrystalline materials; Energy storage and conversion; ELECTROCHEMICAL PROPERTIES; COMPOSITE; NANOROD; FILM;

D O I：

10.1016/j.matlet.2012.01.046

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

MnO2 nanowires clusters are electrodeposited onto Ni foam by a cyclic voltammetric technique. MnO2 nanowires, about 20 nm in diameter and up to 200 nm in length, present a sparse grass clusters structure. As cathode material for supercapacitors, MnO2 nanowires clusters exhibit superior pseudocapacitance performances with high specific capacitances (1080 Fg(-1) at 4 Ag-1 and 415 Fg(-1) at 30 Ag-1) as well as excellent large-current cycling stability, making it suitable for high-performance supercapacitor application. The improved pseudocapacitance performances are attributed to small size, large surface area and high dispersion degree of MnO2 NWs, as well as 3-Dimension structure of Ni foam, which provide faster ion and electron transfer, larger reaction surface area, higher electrochemical activity, leading to faster reaction kinetics and higher material utilization ratio. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：194 / 197

页数：4

共 14 条

[11] High-Energy MnO2 Nanowire/Graphene and Graphene Asymmetric Electrochemical Capacitors
Wu, Zhong-Shuai
Ren, Wencai
Wang, Da-Wei
Li, Feng
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Cheng, Hui-Ming
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Xu, Cailing
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[J]. CHEMICAL COMMUNICATIONS, 2009, (48) : 7575 - 7577
[13] Hierarchically porous Co3O4 film with mesoporous walls prepared via liquid crystalline template for supercapacitor application
Yuan, Y. F.
Xia, X. H.
Wu, J. B.
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Pei, Y. B.
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Guo, S. Y.
[J]. ELECTROCHEMISTRY COMMUNICATIONS, 2011, 13 (10) : 1123 - 1126
[14] Nickel foam-supported porous Ni(OH)2/NiOOH composite film as advanced pseudocapacitor material
Yuan, Y. F.
Xia, X. H.
Wu, J. B.
Yang, J. L.
Chen, Y. B.
Guo, S. Y.
[J]. ELECTROCHIMICA ACTA, 2011, 56 (06) : 2627 - 2632

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