Callerya Atropurpurea shells derived nitrogen doped carbon quantum dots of electrodes for symmetrical and asymmetrical supercapacitors

Callerya Atropurpurea shells derived nitrogen doped carbon quantum dots of electrodes for symmetrical and asymmetrical supercapacitors

Abstract Callerya Atropurpurea shells were utilized as activated carbon precursors in a one-stage activation process at 700 °C using H2SO4, NaOH and KOH as activating agents. Herein, carbon quantum dots (CQDs) were produced via self-doping using urea as a nitrogen source. The structural, functional,...

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Main Authors: Abdulrahman Oyekanmi Adeleke, Mohd Arif Dar, Temitope T. Dele-Afolabi, R. C. Omar, Rasykin Roslan, Akil Ahmad, Ebrahim Mahmoudi, Chua Siew Fen, Ali Orozi Sougui, Mohammed B. Alshammari
Format: Article
Language:English
Published: Nature Portfolio 2025-08-01
Series:Scientific Reports
Subjects:
Callerya Atropurpurea shells
Activated carbon
Carbon quantum dots
Supercapacitors
Asymmetrical
Symmetrical and energy storage
Online Access:https://doi.org/10.1038/s41598-025-15098-2
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Summary:Abstract Callerya Atropurpurea shells were utilized as activated carbon precursors in a one-stage activation process at 700 °C using H2SO4, NaOH and KOH as activating agents. Herein, carbon quantum dots (CQDs) were produced via self-doping using urea as a nitrogen source. The structural, functional, and morphological properties of the doped active materials were examined using X-ray diffraction, Fourier transform infrared spectroscopy, and Raman spectroscopy. The elemental composition was conducted using energy-dispersive X-ray spectroscopy, and surface sensitivity was determined using X-ray photoelectron spectroscopy techniques. The surface properties showed that the nitrogen-doped CQDs produced good crystallinity with an abundance of nitrogen heteroatoms attached to the surface, facilitating the conductivity of the devices. The electrodes of NCQDs-1, NCQDs-2 and NCQDs-3 were prepared and used for the fabrication of asymmetric and symmetric supercapacitor electrodes. The NCQDs-3 electrode used in the asymmetric and symmetrical devices showed a higher specific capacitance of 22 F/g at a current density of 0.5 A/g. Also, the NCQDs-3 electrode achieved the highest coulombic efficiency of 98% and a capacitive retention of 99% even after 1000 GCD cycles.
ISSN:2045-2322

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