Journal
CHEMICAL ENGINEERING JOURNAL
Volume 375, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.121906
Keywords
Ionic liquid electrolyte (ILE); Specific surface area (SSA); Graphene; Specific energy; Nanofibres; Reflux technique
Categories
Funding
- National Research Foundation (NRF) of South Africa [61056]
- Swedish Foundation for International Cooperation in Research and Higher Education within the South Africa-Sweden Bilateral Scientific Research Cooperation Programme [SA2016-6762]
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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 similar to 1317.8 m(2) 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 (1M Na2SO4, 6M 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.
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