Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6602707 | Electrochimica Acta | 2018 | 12 Pages |
Abstract
Carbons with BET specific surface areas of 500â¯m2â¯gâ1 have been produced through the electrolytic reduction of molten Li2CO3-K2CO3-Na2CO3 at the eutectic composition (43.5:25:31.5â¯mol%) onto graphite at 600â¯Â°C and 0.30â¯Aâ¯cmâ2 under a 60â¯mLâ¯minâ1 CO2 gas flow. These carbons have been shown to consist largely of amorphous carbon with some spherical and flake-like conglomerates. Functionalised oxygen has been observed in synthesised carbons using FTIR and XPS. Synthesised carbons have been investigated in 3-electrode cells and analysed using cyclic voltammetry and step potential electrochemical spectroscopy (SPECS) at room temperature. Capacitances as high as 450â¯Fâ¯gâ1 have been observed at 0.0833â¯mVâ¯sâ1 scan rates. The EDLC and pseudo-capacitive behaviour of produced carbons have been analysed and it has been found that the produced carbons behave hybrid capacitors with considerable pseudo-capacitive contributions. The performance of synthesised carbons has been compared to that of activated carbon derived through the chemical activation of carbon from the pyrolysis of coconut husks and to the reported capacitances of commercial activated carbons.
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Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Matthew A. Hughes, Jessica A. Allen, Scott W. Donne,