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Issue 15, 2013
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3D MnO2–graphene composites with large areal capacitance for high-performance asymmetric supercapacitors

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Abstract

In this paper, we reported an effective and simple strategy to prepare large areal mass loading of MnO2 on porous graphene gel/Ni foam (denoted as MnO2/G-gel/NF) for supercapacitors (SCs). The MnO2/G-gel/NF (MnO2 mass: 13.6 mg cm−2) delivered a large areal capacitance of 3.18 F cm−2 (234.2 F g−1) and good rate capability. The prominent electrochemical properties of MnO2/G-gel/NF are attributed to the enhanced conductivities and improved accessible area for ions in electrolytes. Moreover, an asymmetric supercapacitor (ASC) based on MnO2/G-gel/NF (MnO2 mass: 6.1 mg cm−2) as the positive electrode and G-gel/NF as the negative electrode achieved a remarkable energy density of 0.72 mW h cm−3. Additionally, the fabricated ASC device also exhibited excellent cycling stability, with less than 1.5% decay after 10 000 cycles. The ability to effectively develop SC electrodes with high mass loading should open up new opportunities for SCs with high areal capacitance and high energy density.

Graphical abstract: 3D MnO2–graphene composites with large areal capacitance for high-performance asymmetric supercapacitors

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Supplementary files

Article information


Submitted
31 Mar 2013
Accepted
15 May 2013
First published
17 May 2013

Nanoscale, 2013,5, 6790-6796
Article type
Paper

3D MnO2graphene composites with large areal capacitance for high-performance asymmetric supercapacitors

T. Zhai, F. Wang, M. Yu, S. Xie, C. Liang, C. Li, F. Xiao, R. Tang, Q. Wu, X. Lu and Y. Tong, Nanoscale, 2013, 5, 6790
DOI: 10.1039/C3NR01589K

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