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Ultra-high specific capacitance of self-doped 3D hierarchical porous turtle shell-derived activated carbon for high-performance supercapacitors.
- Source :
-
Ceramics International . Feb2022, Vol. 48 Issue 4, p5289-5298. 10p. - Publication Year :
- 2022
-
Abstract
- The turtle shell of biomass waste is used as raw material, and the natural inorganic salt contained in it is used as a salt template in combination with a chemical activation method to successfully prepare a high-performance activated carbon with hierarchical porous structure. The role of hydroxyapatite (HAP) and KOH in different stages of preparation was investigated. The prepared turtle shell-derived activated carbon (TSHC-5) has a well-developed honeycomb pore structure, which gives it a high specific surface area (SSA) of 2828 m2 g−1 with a pore volume of 1.91 cm3 g−1. The excellent hierarchical porous structure and high heteroatom content (O 6.88%, N 5.64%) allow it to have an ultra-high specific capacitance of 727.9 F g−1 at 0.5 A g−1 with 92.27% of capacitance retention even after 10,000 cycles. Excitingly, the symmetric supercapacitor assembled from TSHC-5 activated carbon exhibits excellent energy density and cycling stability in a 1 M Na 2 SO 4 aqueous solution. The energy density is 45.1 Wh·kg−1 at a power density of 450 W kg−1, with 92.05% capacitance retention after 10,000 cycles. Therefore, turtle shell-derived activated carbon is extremely competitive in sustainable new green supercapacitor electrode materials. [Display omitted] • Grass turtle shell contains heteroatoms and HAP for self-doping and as self-templates, respectively. • TSHC-5 has hierarchical porous structure with super high SSA (2828 m2 g−1) and pore volume (1.91 cm3 g−1). • Heteroatoms (O 6.88%, N 5.64%) can improve the wettability and conductivity of electrode materials. • TSHC-5 exhibits an ultra-high specific capacitance of 727.9 F g−1 at 0.5 A g−1. • The energy density of supercapacitor is 45.1 Wh·kg−1 at 450 W kg−1 using 1 M Na 2 SO 4 as electrolyte. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02728842
- Volume :
- 48
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- Ceramics International
- Publication Type :
- Academic Journal
- Accession number :
- 154619251
- Full Text :
- https://doi.org/10.1016/j.ceramint.2021.11.072