High voltage asymmetric supercapacitor based on MnO2 and graphene electrodes

被引：201

作者：

Cao, Jianyun ^{[1
]}

Wang, Yaming ^{[1
]}

Zhou, Yu ^{[1
]}

Ouyang, Jia-Hu ^{[1
]}

Jia, Dechang ^{[1
]}

Guo, Lixin ^{[1
]}

机构：

[1] Harbin Inst Technol, Inst Adv Ceram, Harbin 150001, Peoples R China

来源：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 2013年 / 689卷

关键词：

Manganese oxide; Graphene; Asymmetric supercapacitor; NEUTRAL AQUEOUS-ELECTROLYTE; ELECTROCHEMICAL CAPACITORS; ENERGY DENSITY; RATE CAPABILITY; GRAPHITE OXIDE; ANODE MATERIAL; PERFORMANCE; REDUCTION; CATHODE; CARBONS;

D O I：

10.1016/j.jelechem.2012.10.024

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Asymmetric supercapacitor cells based on MnO2 as positive electrode and graphene as negative electrode have been constructed with 1 M Na2SO4 aqueous electrolyte. Amorphous MnO2 nanoparticles were prepared by reducing KMnO4 in N,N-dimethylformamid (DMF). Graphene was prepared by hydrothermal reduction of exfoliated graphite oxide sheets. The MnO2/graphene asymmetric supercapacitor could operate reversibly at a high cell voltage of 2.0 V. showing an energy density of 25.2 Wh kg(-1) at a power density of 100W kg(-1), which is much higher than those of symmetric supercapacitors based on MnO2/MnO2 (4.9 Wh kg(-1)) and graphene/graphene (3.6 Wh kg(-1)). Moreover, the asymmetric system exhibits capacitance retention of 96% after 500 cycles. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：201 / 206

页数：6

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