1. Preparation of N and S heteroatoms doped activated carbon from stalks of Gossypium hirsutum L. flower for high-performance symmetric supercapacitor application.
- Author
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Saravanan, M., Ramesh, K., Kiruthiga, M., and Pratheep, C.
- Subjects
ACTIVATED carbon ,ENERGY storage ,COTTON ,ENERGY density ,ELECTROCHEMICAL electrodes ,SUPERCAPACITOR electrodes - Abstract
Eco-friendly and cost-effective biomass-derived materials have garnered significant attention for producing porous activated carbon with a high surface area, particularly for applications in supercapacitors. In this study, the stalks of Gossypium hirsutum L. flower were utilized to prepare activated carbon (AC), and thus act as a supercapacitor electrode material. Furthermore, carbon has undergone doping with nitrogen (N) and sulfur (S) atoms to enhance the surface properties of the activated carbons. Out of all the recently prepared materials based on activated carbon, the sulfur-doped activated carbon (S-doped AC) exhibits notable features, particularly in terms of high surface area properties. In 1 M Na
2 SO4 electrolyte, the S-doped AC electrode presents the specific capacitance of 424 F g− 1 at 1 A g− 1 with a remarkable rate capability of 64.8% at 5 A g− 1 of current density in an electrode electrochemical system. Furthermore, the capacitance retention of 95% after 5000 charge/discharge cycles at 5 A g− 1 . The symmetric device composed of S-doped AC//S-doped AC material demonstrates a cell-specific capacitance of 153.6 F g− 1 at 1 A g− 1 , along with impressive energy and power densities of 41.8 Wh kg− 1 and 700 W kg− 1 , respectively, at 1 A g− 1 . At 10 A g− 1 , the symmetric device maintains energy and power densities of 7.7 Wh kg− 1 and 7000 W kg− 1 , respectively. The device demonstrates cyclic stability, retaining 89% of its initial specific capacitance after undergoing 5000 charge/discharge cycles at 10 A g− 1 . Therefore, activated carbon derived from the stalks of Gossypium hirsutum L. flowers emerges as a promising avenue for creating cost-effective, large-scale materials suitable for applications in energy storage devices. [ABSTRACT FROM AUTHOR]- Published
- 2024
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