Enhanced catalytic and supercapacitor activities of DNA encapsulated b-MnO2 nanomaterials
IR@CECRI: CSIR-Central Electrochemical Research Institute, Karaikudi
View Archive Info| Field | Value | |
| Title |
Enhanced catalytic and supercapacitor activities
of DNA encapsulated b-MnO2 nanomaterials
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| Creator |
Sivasankara Rao , E.
Ananthakumar, R. Anantharaj, S. Nithiyanantham, U. Kundu, S. |
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| Subject |
Nanotechnology
Electrochemical Materials Science |
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| Description |
A new approach is developed for the aqueous phase formation of flake-like and wire-like b-MnO2
nanomaterials on a DNA scaffold at room temperature (RT) within a shorter time scale. The b-MnO2
nanomaterials having a band gap energy B3.54 eV are synthesized by the reaction of Mn(II) salt with
NaOH in the presence of DNA under continuous stirring. The eventual diameter of the MnO2 particles in the
wire-like and flake-like morphology and their nominal length can be tuned by changing the DNA to Mn(II) salt
molar ratio and by controlling other reaction parameters. The synthesized b-MnO2 nanomaterials exhibit
pronounced catalytic activity in organic catalysis reaction for the spontaneous polymerization of aniline
hydrochloride to emeraldine salt (polyaniline) at RT and act as a suitable electrode material in electrochemical
supercapacitor applications. From the electrochemical experiment, it was observed that the b-MnO2
nanomaterials showed different specific capacitance (Cs) values for the flake-like and wire-like structures. The
Cs value of 112 F g�1 at 5 mV s�1 was observed for the flake-like structure, which is higher compared to that
of the wire-like structure. The flake-like MnO2 nanostructure exhibited an excellent long-term stability,
retaining 81% of initial capacitance even after 4000 cycles, whereas for the wire-like MnO2 nanostructure,
capacitance decreased and the retention value was only 70% over 4000 cycles. In the future, the present
approach can be extended for the formation of other oxide-based materials using DNA as a promising
scaffold for different applications such as homogeneous and heterogeneous organic catalysis reactions,
Li-ion battery materials or for the fabrication of other high performance energy storage devices
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| Publisher |
Royal Society of Chemistry
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| Date |
2014
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cecri.csircentral.net/3128/1/039-2014.pdf
Sivasankara Rao , E. and Ananthakumar, R. and Anantharaj, S. and Nithiyanantham, U. and Kundu, S. (2014) Enhanced catalytic and supercapacitor activities of DNA encapsulated b-MnO2 nanomaterials. Physical Chemistry Chemical Physics, 16. pp. 21846-21859. ISSN 1463-9076 |
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| Relation |
http://www.rsc.org/pccp
http://cecri.csircentral.net/3128/ |
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