Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 4, Issue 2, Pages 1058-1064Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am2016848
Keywords
graphene-based composite; carbon nanotubes; MnO2; supercapacitor electrode
Funding
- Singapore Ministry of Education [MOE2008-T2-1-004]
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Hierarchical graphene-based composite consisting of graphene sheets intercalated by MnO2-coated carbon nanotubes (MnC) was,prepared for high-performance super capacitor electrode. The highly negatively charged graphene oxides reduced by urea (RGO) and the positively charged MnC functionalized with poly(diallyldimethylammonium chloride) created a strong electrostatic interaction, forming a hierarchical nanostructure. The elelctrocapacitive behaviors of MnC/RGO (MnC-G) were systematically investigated by cyclic voltammetry, galvanostatic charge discharge and electrochemical impedance spectroscopy. A maximum specific capacitance of 193 F/g was achieved for the MnC-G composite with 37% RGO, which was almost 3-fold higher than 69 F/g of carbon nanotubes/RGO and 2-fold higher than 89 F/g of MnO2/RGO composite. Moreover, an excellent rate performance, a good capacitance retention (similar to 70%) and a superior Coulombic efficiency (94-96%) were also observed during the continuous 1300 cycles of galvanostatic charge-discharge.
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