Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 4, Issue 29, Pages 11317-11329Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta01823h
Keywords
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Funding
- Shanghai Pujiang Program [14PJ1403600]
- Shanghai Fundamental Key Project [11JC1403700]
- National Natural Science Foundation of China [61176108]
- PCSIRT
- Research Innovation Foundation of ECNU [78210245]
- Huaian Applied Research [HAG2014034]
- City University of Hong Kong Applied Research Grant (ARG) [9667104]
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A three-step hydrothermal route was designed to fabricate three-dimensional (3D) homo-nanostructured MnO2 (MnO2-MnO2)/nanographene membranes on a macroporous and electrically conductive network (MECN). The preparation technology, structure and morphology, and electrochemical properties of samples are determined systematically. The nanographene/MECN electrode with more defects as the active surface had been synthesized by hydrothermal carbonization. The in situ growth of delta-MnO2 with a carbon-assisted reaction on the nanographene/MECN was strongly adhered to the substrate. The additional alpha-MnO2 with a redox reaction enhanced the mass loading of MnO2, developing the specific capacitance of the MnO2-MnO2/nanographene/MECN electrode. The materials are demonstrated as an electrode with a maximum capacitance of 4.5 F cm(-2) or 179 F cm(-3) (894 F g(-1)) at 1 mA cm(-2) for 1 cm(2) samples and retaining over 83% after 20 000 cycles in 1 M Na2SO4. The MnO2-MnO2/nanographene/ MECN parallel to AC/Ni-foam supercapacitors with high volumetric energy densities exhibit the ideal performance of a supercapacitor (1 mW h cm(-3), 40.3 W h kg(-1), at 1000 W kg(-1)), indicating a promising future for supercapacitors.
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