The supercapacitor performance of hierarchical porous activated carbon electrodes synthesised from demineralised (waste) cumin plant by microwave pretreatment

The supercapacitor performance of hierarchical porous activated carbon electrodes synthesised from demineralised (waste) cumin plant by microwave pretreatment

[Display omitted] •Activated carbons are derived from raw and acid washed cumin plants.•HCl and HF are used as the washing agents to reduce the mineral matter.•Acid washing strongly affects surface properties of the activated carbons.•Acid washed carbon electrodes show better supercapacitive perform...

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Bibliographic Details
Published in:Journal of industrial and engineering chemistry (Seoul, Korea) Vol. 61; pp. 124 - 132
Main Authors: Gurten Inal, I. Isil, Holmes, Stuart M., Yagmur, Emine, Ermumcu, Nurcan, Banford, Anthony, Aktas, Zeki
Format: Journal Article
Language:English
Published: Elsevier B.V 25-05-2018
한국공업화학회
Subjects:
Acid washing
Activated carbon electrode
Biomass
Microwave pretreatment
Supercapacitor
화학공학
Supercapacitor
Biomass
Activated carbon electrode
Acid washing
Microwave pretreatment
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Summary:[Display omitted] •Activated carbons are derived from raw and acid washed cumin plants.•HCl and HF are used as the washing agents to reduce the mineral matter.•Acid washing strongly affects surface properties of the activated carbons.•Acid washed carbon electrodes show better supercapacitive performance.•Acid washing decreases the electrode resistance and promotes the cyclic stability. Activated carbon (AC) was prepared from waste cumin utilising the chemical activation method. The cumin was separately washed with HCl and HF to remove minerals. The surface areas of AC of the acid washed samples (AC-HCl, AC-HF) were 1468 and 1472m2/g, compared with 1361m2/g for AC obtained directly from the precursor. Washing with the acids improved the supercapacitor performance through a significant decrease in the internal resistance of electrodes. The specific capacitances of electrodes using ACs prepared from acid washed samples (HCl and HF) were 127F/g and 155F/g at current density of 1.5mA/cm2, compared with 117F/g from the unwashed precursor.
ISSN:1226-086X
1876-794X
DOI:10.1016/j.jiec.2017.12.009