An innovative concept of use of redox-active electrolyte in asymmetric capacitor based on MWCNTs/MnO2 and Fe2O3 thin films
Chodankar, Nilesh R. (Shivaji University. Department of Physics)
Dubal, Deepak P. (Institut Català de Nanociència i Nanotecnologia)
Lokhande, Abhishek C. (Chonnam National University. Department of Materials Science and Engineering)
Patil, Amar M. (Shivaji University. Department of Physics)
Kim, Jin H. (Chonnam National University. Department of Materials Science and Engineering)
Lokhande, Chandrakant D. (Shivaji University. Department of Physics)

Date:	2016
Abstract:	In present investigation, we have prepared a nanocomposites of highly porous MnO2 spongy 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 MnO2 spongy balls. Further, the supercapacitive properties of these hybrid thin films were evaluated in hybrid electrolyte ((K3[Fe(CN)6 doped aqueous Na2SO4). Thus, this is the first proof-of-design where redox-active electrolyte is applied to MWCNTs/MnO2 hybrid thin films. Impressively, the MWCNTs/MnO2 hybrid film showed a significant improvement in electrochemical performance with maximum specific capacitance of 1012 Fg-1 at 2 mA cm-2 current density in redox-active electrolyte, which is 1. 5-fold higher than that of conventional electrolyte (Na2SO4). Further, asymmetric capacitor based on MWCNTs/MnO2 hybrid film as positive and Fe2O3 thin film as negative electrode was fabricated and tested in redox-active electrolytes. Strikingly, MWCNTs/MnO2//Fe2O3 asymmetric cell showed an excellent supercapacitive performance with maximum specific capacitance of 226 Fg-1 and specific energy of 54. 39 Wh kg-1 at specific power of 667 Wkg-1. Strikingly, actual practical demonstration shows lightning of 567 red LEDs suggesting "ready-to sell" product for industries.
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Energy science and technology ; Materials science ; Nanoscience and technology
Published in:	Scientific reports, Vol. 6 (December 2016) , art. 39205, ISSN 2045-2322

DOI: 10.1038/srep39205
PMID: 27982087

14 p, 2.6 MB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles