Comparison of ionic liquid electrolyte to aqueous electrolytes on carbon nanofibres supercapacitor electrode derived from oxygen-functionalized graphene
Journal article, 2019

A facial force-driven reflux technique was used to develop fibre-like carbon material from freeze-dried reduced graphene oxide (RGO) firstly prepared by using a modified Hummers method. The carbon nanofibres displayed a high specific surface area of ∼1317.8 m2 g−1, with good pore size distributions which could be beneficial for energy storage applications. Electrochemical measurements of the carbon nanofibre electrodes in a symmetric configuration with aqueous (1 M Na2SO4, 6 M KOH), and protic ionic liquid (1-ethylimidazolium bis(trifluoromethanesulfonly)imide) electrolytes (ILE) displayed excellent electrochemical performance with the dominant electric double layer capacitor (EDLC) behaviour. The fabricated device shows higher electrochemical performance in the ILE due to its larger cell operating potential (3.0 V) as compared with the aqueous electrolytes (0.8 V). The optimized electrochemical properties especially in terms of higher specific energy and superior stability, suggest the material's potential applications as electrode for supercapacitors.

Reflux technique



Ionic liquid electrolyte (ILE)

Specific energy

Specific surface area (SSA)


Kabir O. Oyedotun

University of Pretoria

Tshifhiwa Masikhwa

University of Pretoria

Simon Lindberg

Chalmers, Physics, Subatomic and Plasma Physics

Aleksandar Matic

Chalmers, Physics, Materials Physics

Patrik Johansson

Chalmers, Physics, Materials Physics

Ncholu Manyala

University of Pretoria

Chemical Engineering Journal

1385-8947 (ISSN)

Vol. 375 121906

Subject Categories

Textile, Rubber and Polymeric Materials

Materials Chemistry

Other Chemistry Topics



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