title: An innovative concept of use of redox-active electrolyte in asymmetric capacitor based on MWCNTs/MnO2and Fe2O3thin films.
abstract: In present investigation, we have prepared a nanocomposites of highly porous MnO2spongy balls and multi-walled carbon nanotubes (MWCNTs) in thin film form and tested in novel redox-active electrolyte (K3[Fe(CN)6] doped aqueous Na2SO4) for supercapacitor application. Briefly, MWCNTs were deposited on stainless steel substrate by "dip and dry" method followed by electrodeposition of MnO2spongy balls. Further, the supercapacitive properties of these hybrid thin films were evaluated in hybrid electrolyte ((K3[Fe(CN)6doped aqueous Na2SO4). Thus, this is the first proof-of-design where redox-active electrolyte is applied to MWCNTs/MnO2hybrid thin films. Impressively, the MWCNTs/MnO2hybrid film showed a significant improvement in electrochemical performance with maximum specific capacitance of 1012 Fg-1at 2 mA cm-2current density in redox-active electrolyte, which is 1.5-fold higher than that of conventional electrolyte (Na2SO4). Further, asymmetric capacitor based on MWCNTs/MnO2hybrid film as positive and Fe2O3thin film as negative electrode was fabricated and tested in redox-active electrolytes. Strikingly, MWCNTs/MnO2//Fe2O3asymmetric cell showed an excellent supercapacitive performance with maximum specific capacitance of 226 Fg-1and specific energy of 54.39 Wh kg-1at specific power of 667 Wkg-1. Strikingly, actual practical demonstration shows lightning of 567 red LEDs suggesting "ready-to sell" product for industries.
authors.affiliation: Thin Film Physics Laboratory, Department of Physics, Shivaji University, Kolhapur, - 416004 (M.S), India.|School of Applied Chemical Engineering, Chonnam National University, Gwangju 500-757, South Korea.
authors.forename: Nilesh R
authors.initials: NR
authors.lastname: Chodankar
authors.affiliation: Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193 Barcelona, Spain.
authors.forename: Deepak P
authors.initials: DP
authors.lastname: Dubal
authors.affiliation: Department of Materials Science and Engineering, Chonnam National University, Gwangju 500-757, South Korea.
authors.forename: Abhishek C
authors.initials: AC
authors.lastname: Lokhande
authors.affiliation: Thin Film Physics Laboratory, Department of Physics, Shivaji University, Kolhapur, - 416004 (M.S), India.
authors.forename: Amar M
authors.initials: AM
authors.lastname: Patil
authors.affiliation: Department of Materials Science and Engineering, Chonnam National University, Gwangju 500-757, South Korea.
authors.forename: Jin H
authors.initials: JH
authors.lastname: Kim
authors.affiliation: Centre for Interdisciplinary Studies, D.Y. Patil University, Kolhapur, (M.S.) India.
authors.forename: Chandrakant D
authors.initials: CD
authors.lastname: Lokhande