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Molten salt synthesis of nitrogen-doped hierarchical porous carbon from plantain peels for high-performance supercapacitor
This work employs a non-corrosive and non-toxic molten salt combination of NaCl and KCl as an activation agent in an air environment to synthesize nitrogen-doped hierarchical porous carbon from plantain peels at 800 °C for supercapacitor application. Due to the synergistic effect of nitrogen doping,...
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| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | en_US |
| Published: |
Journal of Electroanalytical Chemistry
2024
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| Summary: | This work employs a non-corrosive and non-toxic molten salt combination of NaCl and KCl as an activation
agent in an air environment to synthesize nitrogen-doped hierarchical porous carbon from plantain peels at
800 °C for supercapacitor application. Due to the synergistic effect of nitrogen doping, the synthesized nitrogen-
doped activated unripe porous carbon (AUPN) has a hierarchical (micro-meso-macropores) porous structure
and a high surface area of 959 m2/g, providing sufficient active sites for charge storage, rapid electrolyte
and ionic mobility. X-ray diffraction and Raman spectroscopy analysis revealed the formation of a carbon product
with a limited degree of graphitization and the crystallite size (La), which is valuable for evaluating the
defects caused by nitrogen doping. In a three-electrode cell with a 6 M KOH electrolyte, AUPN recorded a specific
capacitance of 550 F/g at 1 A/g. After 1000 cycles, capacitance retention was 99% at 4 A/g. Compared to
other reported porous carbon materials, the overall electrochemical performance of AUPN is superior. This is
due to the abundant nitrogen-doping, which introduces pseudocapacitance and increases the surface wettability
of the porous carbon, resulting in a decrease in ionic-transport resistance.
These findings indicate that this green and scalable technique is a potential synthesis method for producing
porous carbon materials for energy storage applications. |
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