Graphite-type activated carbon from coconut shell: a natural source for eco-friendly non-volatile storage devices

Graphite-type activated carbon from coconut shell: a natural source for eco-friendly non-volatile storage devices

Carbon from biomass as an active material for supercapacitor electrodes has attracted much interest due to its environmental soundness, abundance, and porous nature. In this context, activated carbon prepared from coconut shells via a simple activation process (water or steam as activation agents) w...

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Published in:RSC advances Vol. 11; no. 5; pp. 2854 - 2865
Main Authors: Keppetipola, Nilanka M, Dissanayake, Maithri, Dissanayake, Pubudu, Karunarathne, Buddhika, Dourges, Marie Anne, Talaga, David, Servant, Laurent, Olivier, Céline, Toupance, Thierry, Uchida, Satoshi, Tennakone, Kirthi, Kumara, G. R. Asoka, Cojocaru, Ludmila
Format: Journal Article
Language:English
Published: England Royal Society of Chemistry 13-01-2021
The Royal Society of Chemistry
Subjects:
Activated carbon
Aqueous electrolytes
Biomass
Capacitance
Chemical Sciences
Chemistry
Configurations
Current density
Electrochemical analysis
Electrodes
Electrolytes
Electronic devices
Energy storage
Filter paper
Graphite
Ionic liquids
Mass spectrometry
Material chemistry
Mathematical analysis
Other
Polyethylene
Polyethylenes
Raman spectra
Raman spectroscopy
Separators
Stability tests
Substrates
Sulfuric acid
Supercapacitors
Surface area
Thermogravimetry
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Summary:Carbon from biomass as an active material for supercapacitor electrodes has attracted much interest due to its environmental soundness, abundance, and porous nature. In this context, activated carbon prepared from coconut shells via a simple activation process (water or steam as activation agents) was used as an active material in electrodes for eco-friendly supercapacitors. X-ray diffraction (XRD), Raman spectroscopy, conductivity, scanning electron microscopy (SEM), N 2 sorption and thermogravimetry coupled to mass spectrometry (TGA-MS) studies revealed that activated carbon produced by this approach exhibit a graphitic phase, a high surface area, and large pore volume. The energy storage properties of activated carbon electrodes correlate with the morphological and structural properties of the precursor material. In particular, electrodes made of activated carbon exhibiting the largest Brunauer-Emmett-Teller (BET) surface area, i.e. 1998 m 2 g −1 , showed specific capacitance of 132.3 F g −1 in aqueous electrolyte (1.5 M H 2 SO 4 ), using expanded graphite sheets as current collector substrates. Remarkably, this sample in a configuration with ionic liquid (1-methyl-1-propy-pyrrolizinium bis(fluorosulfonyl)mide) (MPPyFSI) as electrolyte and a polyethylene separator displayed an outstanding storage capability and energy-power handling capability of 219.4 F g −1 with a specific energy of 92.1 W h kg −1 and power density of 2046.9 W kg −1 at 1 A g −1 and maintains ultra-high values at 30 A g −1 indicating the ability for a broad potential of energy and power related applications. To the best of our knowledge, these values are the highest ever reported for ionic liquid-based supercapacitors with activated carbon obtained from the biomass of coconut shells. Simple ecofriendly activation process of carbon obtained from coconut shell-based waste was used for the fabrication of non-volatile high performance supercapacitors.
Bibliography:2
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filter paper; Table S6: calculated capacitance values for AC5-based supercapacitor in configuration with MPPyFSI:filter paper and MPPyFSI:polyethylene; Fig. S5: stability tests of sealed supercapacitor. See DOI
BET surface area; Table S2: calculated capacitance values for each activated carbon-based supercapacitor with the FTO:AC-KOH-filter paper-KOH-AC/FTO configuration; Fig. S4: electrochemical characterization of the supercapacitor-based on the AC5 electrodes with FTO:AC5-KOH-filter paper-KOH-AC5/FTO configuration, CV at different scan rates, specific capacitance calculated from CV, CD curves at different current densities, specific capacitance calculated from CD at different current densities; Table S3: calculated capacitance values, from CV at different scan speed and CD at different specific current, for each activated carbon-based supercapacitor with FTO:AC5-KOH-filter paper-KOH-AC5/FTO configuration; Table S4: simulated parameters extracted from impedance measurements; Table S5: calculated capacitance values for AC5-based supercapacitor in configuration with H
SO
Electronic supplementary information (ESI) available: Table S1: configuration of the supercapacitors used in this study; Fig. S1: curve fit of Raman spectra of activated carbon; Fig. S2: thermograms for the activated carbons AC1-AC5; Fig. S3: digital picture of the supercapacitor (liquid type), CV, and CD of different activated carbon electrodes, specific capacitance
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10.1039/d0ra09182k
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:2046-2069
2046-2069
DOI:10.1039/d0ra09182k