Journal
NANOSCALE
Volume 5, Issue 15, Pages 6790-6796Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3nr01589k
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Funding
- Natural Science Foundations of China [21273290]
- Strategic emerging industries in Guangdong Province [2011A010802004]
- Integration of Production and Research Project of the Ministry [2011B090400618]
- Integration of Production and Research Project of Guangdong Province [2011B090400618]
- Research Fund for the Doctoral Program of Higher Education of China [20120171110043]
- Academic New Artist Ministry of Education Doctoral Post Graduate (China) for China Scholarship Council
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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.
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