Nickel foam-based manganese dioxide-carbon nanotube composite electrodes for electrochemical supercapacitors
Nickel foam-based manganese dioxide-carbon nanotube composite electrodes for electrochemical supercapacitors
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DOI：
10.1016/j.jpowsour.2008.07.057
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发表时间：
2008-12-01
影响因子：
9.2
通讯作者：
Zhitornirsky, Igor
中科院分区：
文献类型：
--
作者：
Li, Jun;Yang, Quan Min;Zhitornirsky, Igor
采用化学沉淀法制备了长度为0.1 ~ 1 μ m、直径为2-4 nm的二氧化锰纳米纤维。将二氧化锰纳米纤维和多壁碳纳米管（MWCNTs）浆料浸渍到多孔泡沫镍集流体中，制备了电化学超级电容器复合电极。在复合电极中，多壁碳纳米管在泡沫镍电池中形成了次级导电网络。得到的复合电极，含有0- 20 wt.%总质量负载量为40 mgcm（-2）的MWCNT在0.1-0.5 M Na 2SO 4溶液中表现出电容行为。在0.5 M Na_2SO_4溶液中，扫描速率为2 mVs（-1）时，获得了155 Fg（-1）的最高比电容（SC）。SC随着复合材料中MWCNT含量的增加和溶液中Na 2SO 4浓度的增加而增加，并随着扫描速率的增加而降低。(C)2008 Elsevier B. V.保留所有权利。(C)2008 Elsevier B. V.保留所有权利。
Manganese dioxide nanofibers with length ranged from 0.1 to 1 mu m and a diameter of about 2-4 nm were prepared by a chemical precipitation method. Composite electrodes for electrochemical supercapacitors were fabricated by impregnation of slurries of the manganese dioxide nanofibers and multiwalled carbon nanotubes (MWCNTs) into porous nickel foam current collectors. In the composite electrodes, MWCNT formed a secondary conductivity network within the nickel foam cells. Obtained composite electrodes, containing 0-20wt.% MWCNT with total mass loading of 40 mgcm(-2), showed a capacitive behavior in the 0.1-0.5 M Na2SO4 solutions. The highest specific capacitance (SC) of 155 Fg(-1) was obtained at a scan rate of 2 mVs(-1) in the 0.5 M Na2SO4 solutions. The SC increased with increasing MWCNT content in the composite materials and increasing Na2SO4 concentration in the solutions and decreased with increasing scan rate. (C) 2008 Elsevier B.V. All rights reserved. (C) 2008 Elsevier B.V. All rights reserved.