Asymmetric Supercapacitors Based on Graphene/MnO2 and Activated Carbon Nanofiber Electrodes with High Power and Energy Density

被引：1827

作者：

Fan, Zhuangjun ^{[1
]}

Yan, Jun ^{[1
]}

Wei, Tong ^{[1
]}

Zhi, Linjie ^{[2
]}

Ning, Guoqing ^{[3
]}

Li, Tianyou ^{[1
]}

Wei, Fei ^{[4
]}

机构：

[1] Harbin Engn Univ, Coll Mat Sci & Chem Engn, Minist Educ, Key Lab Superlight Mat & Surface Technol, Harbin 150001, Peoples R China

[2] Natl Ctr Nanosci & Technol China, Beijing 100190, Peoples R China

[3] China Univ Petr, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China

[4] Tsinghua Univ, Dept Chem Engn, Beijing Key Lab Green Chem React Engn & Technol, Beijing 100084, Peoples R China

来源：

ADVANCED FUNCTIONAL MATERIALS | 2011年 / 21卷 / 12期

基金：

中国博士后科学基金; 美国国家科学基金会;

关键词：

ELECTROCHEMICAL CAPACITORS; AQUEOUS-ELECTROLYTES; 2; V; PERFORMANCE; MNO2; COMPOSITE; SURFACE; OXIDES; POLYANILINE; DEPOSITION;

D O I：

10.1002/adfm.201100058

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Asymmetric supercapacitor with high energy density has been developed successfully using graphene/MnO2 composite as positive electrode and activated carbon nanofibers (ACN) as negative electrode in a neutral aqueous Na2SO4 electrolyte. Due to the high capacitances and excellent rate performances of graphene/MnO2 and ACN, as well as the synergistic effects of the two electrodes, such asymmetric cell exhibits superior electrochemical performances. An optimized asymmetric supercapacitor can be cycled reversibly in the voltage range of 0-1.8 V, and exhibits maximum energy density of 51.1 Wh kg(-1), which is much higher than that of MnO2//DWNT cell (29.1 Wh kg(-1)). Additionally, graphene/MnO2//ACN asymmetric supercapacitor exhibits excellent cycling durability, with 97% specific capacitance retained even after 1000 cycles. These encouraging results show great potential in developing energy storage devices with high energy and power densities for practical applications.

引用

页码：2366 / 2375

页数：10

共 68 条

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