A high-performance asymmetric supercapacitor based on carbon and carbon-MnO2 nanofiber electrodes

被引：313
作者：
Wang, Jian-Gan [1 ,2 ]
Yang, Ying [3 ,4 ]
Huang, Zheng-Hong [1 ]
Kang, Feiyu [1 ,2 ]
机构：
[1] Tsinghua Univ, Dept Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
[2] Tsinghua Univ, Grad Sch Shenzhen, Inst Adv Mat Res, Shenzhen 518055, Peoples R China
[3] Tsinghua Univ, Dept Elect Engn, Beijing 100084, Peoples R China
[4] Tsinghua Univ, State Key Lab Control & Simulat Power Syst & Gene, Beijing 100084, Peoples R China
来源：
CARBON | 2013年 / 61卷
基金：
中国国家自然科学基金;
关键词：
ELECTROCHEMICAL CAPACITORS; MANGANESE-DIOXIDE; AQUEOUS-ELECTROLYTE; COMPOSITE ELECTRODES; NANOSTRUCTURED MNO2; HYBRID CAPACITOR; ENERGY DENSITY; HIGH-POWER; GRAPHENE; BEHAVIOR;
D O I：
10.1016/j.carbon.2013.04.084
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：
An asymmetric supercapacitor with high energy and power densities has been fabricated using MnO2/carbon nanofiber composites as positive electrode and activated carbon nanofibers as negative electrode in Na2SO4 aqueous electrolyte. Both electrode materials are freestanding in nature without any conductive additives or binders and exhibit outstanding electrochemical performances. The as-assembled asymmetric supercapacitor with optimal mass ratio can be operated reversibly over a wide voltage range of 0-2.0 V, and presents a maximum energy density of 30.6 Wh kg(-1), which is much higher than those of symmetric supercapacitors. More-over, the supercapacitor exhibits excellent rate capability (high power density of 20.8 kW kg(-1) at 8.7 Wh kg(-1)) and long-term cycling stability with only 6% loss of its initial capacitance after 5000 cycles. These attractive results make these freestanding materials promising for applications in aqueous electrolyte-based asymmetric supercapacitors with high energy and power densities delivery. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：190 / 199
页数：10
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