Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 689, Issue -, Pages 201-206Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2012.10.024
Keywords
Manganese oxide; Graphene; Asymmetric supercapacitor
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Funding
- NSFC [50701014, 60776803, 51021002]
- Fundamental Research Funds for the Central Universities [HIT. BRETIII. 201202]
- program for New Century Excellent Talents in University of China [NCET-08-0166]
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Asymmetric supercapacitor cells based on MnO2 as positive electrode and graphene as negative electrode have been constructed with 1 M Na2SO4 aqueous electrolyte. Amorphous MnO2 nanoparticles were prepared by reducing KMnO4 in N,N-dimethylformamid (DMF). Graphene was prepared by hydrothermal reduction of exfoliated graphite oxide sheets. The MnO2/graphene asymmetric supercapacitor could operate reversibly at a high cell voltage of 2.0 V. showing an energy density of 25.2 Wh kg(-1) at a power density of 100W kg(-1), which is much higher than those of symmetric supercapacitors based on MnO2/MnO2 (4.9 Wh kg(-1)) and graphene/graphene (3.6 Wh kg(-1)). Moreover, the asymmetric system exhibits capacitance retention of 96% after 500 cycles. (C) 2012 Elsevier B.V. All rights reserved.
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