Asymmetric Supercapacitors Based on Graphene/MnO<sub>2</sub> and Activated Carbon Nanofiber Electrodes with High Power and Energy Density

Advanced Functional Materials - Tập 21 Số 12 - Trang 2366-2375 - 2011
Zhuangjun Fan1, Jun Yan1, Tong Wei1, Linjie Zhi2, Guoqing Ning3, Tianyou Li1, Fei Wei4
1Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, P.R. China
2National Center for Nanoscience and Technology of China, Zhongguancun, Beiyitiao 11, Beijing 100190, P. R. China
3State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, 102249, P, .R. China
4Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, P.R. China

Tóm tắt

AbstractAsymmetric 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.

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Thông tin xuất bản

Advanced Functional Materials

Tập 21 Số 12

2366-2375

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