Comparison of ionic liquid electrolyte to aqueous electrolytes on carbon nanofibres supercapacitor electrode derived from oxygen-functionalized graphene
Artikel i vetenskaplig tidskrift, 2019

© 2019 Elsevier B.V. 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.

Nanofibres

Reflux technique

Specific surface area (SSA)

Specific energy

Graphene

Ionic liquid electrolyte (ILE)

Författare

Kabir O. Oyedotun

Universiteit van Pretoria

Tshifhiwa Masikhwa

Universiteit van Pretoria

Simon Lindberg

Chalmers, Fysik, Subatomär fysik och plasmafysik

Aleksandar Matic

Chalmers, Fysik, Kondenserade materiens fysik

Patrik Johansson

Chalmers, Fysik, Kondenserade materiens fysik

Ncholu Manyala

Universiteit van Pretoria

Chemical Engineering Journal

1385-8947 (ISSN)

Vol. 375 121906

Ämneskategorier

Textil-, gummi- och polymermaterial

Materialkemi

Annan kemi

DOI

10.1016/j.cej.2019.121906

Mer information

Senast uppdaterat

2019-09-18