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.
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.