Sakthivel Ranganathan (2024) Synthesizing activated carbon from coconut shells and evaluating its electrochemical characteristics for supercapacitors. Synthesizing activated carbon from coconut shells and evaluating its electrochemical characteristics for supercapacitors, 18 (7). pp. 1-5.

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Abstract

Activated carbon derived from coconut shells underwent successful synthesis
employing three distinct chemical activators: NaOH, H3
PO4
, and ZnCl2
.
Harvested from highland regions with freshwater environments, coconut shells
were solar thermally dried prior to carbonization at 600⁰C for 3 hours, followed
by thorough activation. Characterization of the samples encompassed X-Ray
Diffraction (XRD), Fourier Transform Infrared (FTIR), to discern crystal
structure, functional groups, surface area, and morphology. XRD analysis
revealed the formation of an amorphous phase with carbon graphite as the
predominant constituent, while impurities such as hydrogen, oxygen, nitrogen,
potassium, sodium, phosphorus, calcium, and magnesium were identified.
FTIR spectroscopy indicated no significant discrepancies across the three
activating agents, affirming successful activation through the presence of –OH, C=O, and C-O functional groups. These findings collectively endorse
the potential applicability of coconut shell-based activated carbon in water
purification treatments. The compacted activated carbon underwent cyclic
voltammetry testing across varied scan rates ranging from 20 mV/s to 100
mV/s, within a potential window of 0.05 to 0.8. Specific capacitance values
were recorded at each scan rate: 602.19 F/g, 299.78 F/g, 378.31 F/g, 374.13
F/g, and 286.92 F/g, respectively. Notably, the highest specific capacitance
of 600.89 F/g and an energy density of 45.64 Wh/kg were achieved at a scan
rate of 20 mV/s. Comparative analysis with prior research indicated that the
synthesized activated carbon electrodes in this study exhibited the highest
specific capacitance observed to date.

Item Type: Article
Uncontrolled Keywords: Stereotactic Body Radiotherapy (SBRT), Dice Similarity Coefficient (DSC), Geographical Miss Index (GMI) and Discordance Index (DI), Four-Dimensional Computed Tomography (4-DCT) images
Divisions: PSG College of Arts and Science > Department of Electronics
Depositing User: Dr. B Sivakumar
Date Deposited: 01 Dec 2025 10:07
Last Modified: 01 Dec 2025 10:07
URI: https://ir.psgcas.ac.in/id/eprint/2549

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