Synthesis of Free-Standing Flexible rGO/MWCNT Films for Symmetric Supercapacitor Application

Nanoscale Research Letters
Amit KumarTseung Yuen Tseng

Abstract

Herein, we report a novel, simple, and cost-effective way to synthesize flexible and conductive rGO and rGO/MWCNT freestanding films. The effects of MWCNT addition on the electrochemical performance of rGO/MWCNT nanocomposite films are investigated in some strong base aqueous electrolytes, such as KOH, LiOH, and NaOH via three-electrode system. The supercapacitor behavior of the films is probed via cyclic voltammetry, galvanostatic charging-discharging, and electrochemical impedance spectroscopy. The structural and morphological studies of the films are performed by X-ray diffractometer, Raman spectrometer, surface area analyzer, thermogravimetric analysis, field emission scanning electron microscope and transmission electron microscope. The rGO/MWCNT film synthesized with 10 wt% MWCNTs (GP10C) exhibits high specific capacitance of 200 Fg-1, excellent cyclic stability with 92% retention after 15,000 long cycle test, small relaxation time constant (~ 194 ms), and high diffusion coefficient (7.8457 × 10-9 cm2 s-1) in 2 M KOH electrolyte. Furthermore, the symmetric supercapacitor coin cell with GP10C as both anode and cathode using 2 M KOH as electrolyte demonstrates high energy density of 29.4 Whkg-1 and power density of 439 Wkg-...Continue Reading

References

Oct 23, 2004·Science·K S NovoselovA A Firsov
Mar 3, 2007·Nature Materials·A K Geim, K S Novoselov
Aug 25, 2010·ACS Nano·Daniela C MarcanoJames M Tour
Nov 26, 2010·Nature Chemistry·Kian Ping LohManish Chhowalla
May 17, 2011·ACS Applied Materials & Interfaces·Sumanta Kumar MeherG Ranga Rao
Jan 24, 2012·ACS Applied Materials & Interfaces·Zhibin LeiLi Lu
Jan 25, 2012·Advanced Materials·Fei LiuHongjie Zhang
Oct 18, 2012·The Journal of Physical Chemistry Letters·Zhanwei XuDavid Mitlin
May 24, 2017·Nanoscale·Santiago Jose Cartamil-BuenoSamer Houri

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Citations

Mar 27, 2020·ChemSusChem·Amrita De AdhikariRaz Jelinek

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Methods Mentioned

BETA
thermal reduction
X-ray
ESR

Software Mentioned

NAPSON

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