Advanced Asymmetric Supercapacitors Based on Ni(OH)<sub>2</sub>/Graphene and Porous Graphene Electrodes with High Energy Density

Advanced Functional Materials - Tập 22 Số 12 - Trang 2632-2641 - 2012
Jun Yan1, Zhuangjun Fan1, Wei Sun1, Guoqing Ning2, Tong Wei1, Qiang Zhang3, Fei Wei3, Linjie Zhi4, Fei Wei3
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
2State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, 102249, P, .R. China
3Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, P.R. China
4National Center for Nanoscience and Technology of China, Zhongguancun, Beiyitiao 11, Beijing 100190, P. R. China

Tóm tắt

AbstractHierarchical flowerlike nickel hydroxide decorated on graphene sheets has been prepared by a facile and cost‐effective microwave‐assisted method. In order to achieve high energy and power densities, a high‐voltage asymmetric supercapacitor is successfully fabricated using Ni(OH)2/graphene and porous graphene as the positive and negative electrodes, respectively. Because of their unique structure, both of these materials exhibit excellent electrochemical performances. The optimized asymmetric supercapacitor could be cycled reversibly in the high‐voltage region of 0–1.6 V and displays intriguing performances with a maximum specific capacitance of 218.4 F g−1 and high energy density of 77.8 Wh kg−1. Furthermore, the Ni(OH)2/graphene//porous graphene supercapacitor device exhibits an excellent long cycle life along with 94.3% specific capacitance retained after 3000 cycles. These fascinating performances can be attributed to the high capacitance and the positive synergistic effects of the two electrodes. The impressive results presented here may pave the way for promising applications in high energy density storage systems.

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Thông tin xuất bản

Advanced Functional Materials

Tập 22 Số 12

2632-2641

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