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In present investigation, we have prepared a nanocomposites of highly porous MnO 2  spongy balls and multi-walled carbon nanotubes (MWCNTs) in thin film form and tested in novel redox-active electrolyte (K 3 [Fe(CN) 6 ] doped aqueous Na 2 SO 4 ) for supercapacitor application. Briefly, MWCNTs were deposited on stainless steel substrate by “dip and dry” method followed by electrodeposition of MnO 2  spongy balls. Further, the supercapacitive properties of these hybrid thin films were evaluated in hybrid electrolyte ((K 3 [Fe(CN) 6  doped aqueous Na 2 SO 4 ). Thus, this is the first proof-of-design where redox-active electrolyte is applied to MWCNTs/MnO 2  hybrid thin films. Impressively, the MWCNTs/MnO 2  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 (Na 2 SO 4 ). Further, asymmetric capacitor based on MWCNTs/MnO 2  hybrid film as positive and Fe 2 O 3  thin film as negative electrode was fabricated and tested in redox-active electrolytes. Strikingly, MWCNTs/MnO 2 //Fe 2 O 3  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.

An innovative concept of use of redox-active electrolyte in asymmetric capacitor based on MWCNTs/MnO2 and Fe2O3 thin films