Journal
DIAMOND AND RELATED MATERIALS
Volume 128, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2022.109307
Keywords
Flixweed seeds; Hierarchical porous carbon; Biomass; Supercapacitor; Ultra -high electrochemical property
Categories
Funding
- National Natural Science Foundation of China [51472174, 61604086, 21776147]
- Shandong Natural Science Foundation [ZR2018BB066, 2016GGX104010]
- Malmstrom Endowment Fund at Hamline University
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In this work, flixweed seeds are successfully converted into hierarchical porous carbon materials with large specific surface area and self-doped heteroatoms. The resulting carbon material shows excellent performance in supercapacitors, with high specific capacitance and long cycling life. A symmetric supercapacitor based on this carbon material also exhibits high energy density.
The fabrication of carbon materials with low cost and high performance is the main challenge in wide appli-cations of supercapacitors. In this work, facile carbonization and chemical activation processes are developed to convert flixweed seeds to hierarchical porous carbon with large specific surface area and self-doped ample heteroatoms (e.g., nitrogen, sulfur and oxygen). The obtained carbon material demonstrates several advantages in supercapacitors, such as ultrahigh specific capacitance of 662.4 F g-1 at 0.5 A g-1 and long cycling life > 12,000 cycles at 20 A g-1. A symmetric supercapacitor based on the resulting carbon delivers a high energy density of 34 W h kg-1 at 1000 W kg-1 in 1 M Na2SO4. Therefore, flixweed seeds can be economically utilized for large-scale production of porous carbon with excellent supercapacitance performance.
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