Facile synthesis of hollow sphere amorphous MnO2: the formation mechanism, morphology and effect of a bivalent cation-containing electrolyte on its supercapacitive behavior
IR@CECRI: CSIR-Central Electrochemical Research Institute, Karaikudi
View Archive Info| Field | Value | |
| Title |
Facile synthesis of hollow sphere amorphous MnO2: the
formation mechanism, morphology and effect of a
bivalent cation-containing electrolyte on its
supercapacitive behavior
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| Creator |
Munaiah, Y.
Gnana Sundara Raj, B. Premkumar, T. Ragupathy, P. |
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| Subject |
Fuel Cells
Electrochemical Power Sources |
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| Description |
Nearly X-ray amorphous hollow sphere manganese oxides (hollow sphere MnO2) have been synthesized by
a carboxylic acid-mediated system containing KMnO4 and Na2S2O4 under ambient conditions for
supercapacitor applications. The product was characterized by powder XRD, Raman spectroscopy and
thermal analysis. SEM and TEM were used to investigate the morphology of MnO2. The as-prepared
MnO2 was X-ray amorphous and had particles in the size range 0.1–1 mm. A mechanism has been
proposed for the formation of hollow sphere structures in the micro-emulsion medium. Upon annealing
the sample at temperatures greater than 500 �C, the amorphous MnO2 transforms into Mn2O3. Cyclic
voltammetry and galvanostatic charge–discharge cycling were used to evaluate the electrochemical
performance. The initial discharge capacities were found to be 283 and 188 F g�1 in 0.1 M Ca(NO3)2
and 0.1 M Na2SO4, respectively, at a current density of 0.5 mA cm�2. The higher specific capacitance in
the electrolyte with a bivalent cation is attributed to the reduction of two Mn4+ to Mn3+ by each of the
bivalent cations present in the electrolyte
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| Date |
2013-01-25
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cecri.csircentral.net/3005/1/034-2013.pdf
Munaiah, Y. and Gnana Sundara Raj, B. and Premkumar, T. and Ragupathy, P. (2013) Facile synthesis of hollow sphere amorphous MnO2: the formation mechanism, morphology and effect of a bivalent cation-containing electrolyte on its supercapacitive behavior. Journal of Materials Chemistry A (1). pp. 4300-4306. |
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| Relation |
http://cecri.csircentral.net/3005/
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