Synthesis of MnO2/Carbon Dots Nanocomposite Derived From Rice Husk for Supercapacitor Electrodes

Akhiruddin Maddu, Angga Saputra, Noor Intan Ayuningtiyas, Annisa Tsalsabila, Nurhalim Nurhalim

Abstract


This article reports the use of carbon dots (C-dots) derived from rice husk that was composited with MnO2 to be applied as supercapacitor electrodes. Carbon dots were synthesized by acid hydrolysis method with the addition of nitrogen doping. Carbon dots produced were well dispersed in water and show a blue-green emission under UV light exposure. Spectra of fluorescence emission were taken using a violet laser (405 nm) as excitation source that resulted in broad spectra with the peak wavelength at 497 nm. The average particle size (APS) of carbon dots measured by using particle size analyzer (PSA) was found about 11 nm. MnO2/carbon dots (MnO2/C-dots) nanocomposites were made by mixing MnO2 and carbon dots solution. The nanocomposite samples were characterized their crystal structure, morphology, and chemical composition. X-ray Diffraction (XRD) and Energy Dispersive X-ray Spectroscopy (EDXS) analysis confirmed the presence of any element that forming the nanocomposites. The nanocomposite electrodes were fabricated by coating the produced composites onto the glassy graphite electrode, then measured their electrochemical characteristics from which can be determined the specific capacitance of the electrodes. Based on cyclic voltammetry curves, it found the best specific capacitance value is 308 F/g.


Keywords


Carbon dots; rice husk; specific capacitance; supercapacitor

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DOI (PDF): https://doi.org/10.20508/ijrer.v8i3.7673.g7446

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