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Supercapacitors based on freeze dried MnO2 embedded PEDOT: PSS hybrid sponges

Publication Type : Journal Article

Thematic Areas : Nanosciences and Molecular Medicine

Publisher : Microporous and Mesoporous Materials

Source : Microporous and Mesoporous Materials, Volume 186, p.30-36 (2014)

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Keywords : Battery, Capacitors, Conducting polymers, Differential thermal analysis, Electrodes, freeze drying, Manganese oxide, Mesoporous, MnO2, scanning electron microscopy, Super capacitor, Weibull distribution

Campus : Kochi

School : Center for Nanosciences

Center : Amrita Center for Nanosciences and Molecular Medicine Move, Nanosciences

Department : Nanosciences and Molecular Medicine

Year : 2014

Abstract : The present study investigates in detail the synthesis and characterization of PEDOT: PSS/MnO2 hybrid sponge electrodes for supercapacitor/ battery applications. These hybrid sponges were prepared using freeze drying technique and showed hierarchical pores ranging from micron to nanometric size. Scanning electron microscopy-energy dispersive X-ray showed uniform dispersion of MnO2 along the PEDOT: PSS matrix. Thermo gravimetric-differential thermal analysis showed higher thermal stability for these hybrid constructs compared to PEDOT: PSS sponges. From the electrochemical studies, an intrinsic correlation between overall specific capacitance, morphology and weight percentage of MnO2 in the PEDOT: PSS matrix has been defined and explained in KOH electrolyte system. High cyclic stability was observed at the end of 2000 cycles for these hybrid sponges with less than 5 % capacitance fading. These sponges exhibit mass specific capacitance values as high as 10688 F g-1 which was found to be 35% higher compare to PEDOT: PSS sponges as obtained from Weibull statistics. The application of these electrodes was explored in a fully functional asymmetric coin cell unit where an energy and power density of 200 mWh kg-1 and 6.4 kW kg-1, was obtained, respectively. © 2013 Elsevier B.V. All rights reserved.

Cite this Research Publication : R. Ranjusha, Sajesh, K. M., Roshny, S., Lakshmi, V., Anjali, P., Sonia, T. S., A. Nair, S., Subramanian, K. R. V., Nair, S. V., Chennazhi, K. P., and Balakrishnan, A., “Supercapacitors based on freeze dried MnO2 embedded PEDOT: PSS hybrid sponges”, Microporous and Mesoporous Materials, vol. 186, pp. 30-36, 2014.

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