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Title: DNA-assisted assembly of carbon nanotubes and MnO2 nanospheres as electrodes for high-performance asymmetric supercapacitors
Authors: Guo, C.X.
Chitre, A.A.
Lu, X. 
Issue Date: 14-Mar-2014
Citation: Guo, C.X., Chitre, A.A., Lu, X. (2014-03-14). DNA-assisted assembly of carbon nanotubes and MnO2 nanospheres as electrodes for high-performance asymmetric supercapacitors. Physical Chemistry Chemical Physics 16 (10) : 4672-4678. ScholarBank@NUS Repository.
Abstract: A DNA-assisted assembly approach is developed to fabricate a capacitor-type electrode material, DNA-functionalized carbon nanotubes (CNTs@DNA), and a battery-type electrode material, DNA@CNTs-bridged MnO2 spheres (CNTs@DNA-MnO2), for asymmetric supercapacitors. An energy density of 11.6 W h kg-1 is achieved at a power density of 185.5 W kg -1 with a high MnO2 mass loading of 4.2 mg cm -2. It is found that DNA assembly plays a critical role in the enhanced supercapacitor performance. This is because while DNA molecules functionalize carbon nanotubes (CNTs) via π-π stacking, their hydrophilic sugar-phosphate backbones also promote the dispersion of CNTs. The resultant CNTs@DNA chains can link multiple MnO2 spheres to form a networked architecture that facilitates charge transfer and effective MnO2 utilization. The improved performance of the asymmetric supercapacitors indicates that DNA-assisted assembly offers a promising approach to the fabrication of high-performance energy storage devices. © 2014 the Owner Societies.
Source Title: Physical Chemistry Chemical Physics
ISSN: 14639076
DOI: 10.1039/c3cp54911a
Appears in Collections:Staff Publications

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