Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 25, Issue 4, Pages 627-635Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201403554
Keywords
anodes; asymmetric supercapacitors; functionalized graphene nanosheets; hematite; quantum dots
Categories
Funding
- National Natural Science Foundation of China [51102134, 51202106]
- Natural Science Foundation of Jiangsu Province [BK20131349]
- QingLan Project of Jiangsu Province
- China Postdoctoral Science Foundation [2013M530258]
- Jiangsu Planned Projects for Postdoctoral Research Funds [1202001B]
- Russian Scientific Fund [14-43-00072]
- Russian Science Foundation [14-43-00072] Funding Source: Russian Science Foundation
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For building high-energy density asymmetric supercapacitors, developing anode materials with large specific capacitance remains a great challenge. Although Fe2O3 has been considered as a promising anode material for asymmetric supercapacitors, the specific capacitance of the Fe2O3-based anodes is still low and cannot match that of cathodes in the full cells. In this work, a composite material with well dispersed Fe2O3 quantum dots (QDs, approximate to 2 nm) decorated on functionalized graphene-sheets (FGS) is prepared by a facile and scalable method. The Fe2O3 QDs/FGS composites exhibit a large specific capacitance up to 347 F g(-1) in 1 m Na2SO4 between -1 and 0 V versus Ag/AgCl. An asymmetric supercapacitor operating at 2 V is fabricated using Fe2O3/FGS as anode and MnO2/FGS as cathode in 1 m Na2SO4 aqueous electrolyte. The Fe2O3/FGS//MnO2/FGS asymmetric supercapacitor shows a high energy density of 50.7 Wh kg(-1) at a power density of 100 W kg(-1) as well as excellent cycling stability and power capability. The facile synthesis method and superior supercapacitive performance of the Fe2O3 QDs/FGS composites make them promising as anode materials for high-performance asymmetric supercapacitors.
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