1. Hierarchical porous carbon obtained from directly carbonizing carex meyeriana for high-performance supercapacitors
- Author
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Wei Zhang, Guiqiang Wang, Jieqiong Liu, Miao Lei, and Jiayu Bi
- Subjects
Supercapacitor ,Materials science ,Carbonization ,chemistry.chemical_element ,Electrolyte ,Condensed Matter Physics ,Capacitance ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,chemistry ,Chemical engineering ,Electrical and Electronic Engineering ,Mesoporous material ,Carbon ,Current density ,Power density - Abstract
Hierarchical porous carbon materials with high surface area are facilely prepared by directly carbonizing carex meyeriana without any extra activation procedure. The as-prepared porous carbon samples possess high Brunauer–Emmett–Teller (BET) surface areas (in the ~ 518–742 m2 g−1 range) and unique hierarchical porous structure containing macropore channels and mesopores and micropores developed in the wall of macropores. These intriguing characteristics make the as-prepared hierarchical porous carbon samples a promising electrode material for supercapacitors. The capacitive performance was measured in the three-electrode system with 6 M KOH electrolyte. The hierarchical porous carbon prepared at the carbonization temperature of 1000 °C presents a high specific capacitance of 178.6 F g−1 at a current density of 0.5 A g−1, a good rate performance ( about 65.2% retention ratio at the current density of 20 A g−1), and an excellent cycling stability (no obvious performance fading after 10,000 cycles). In addition, the fabricated two-electrode device achieves an energy density of 4.33 Wh kg−1 at a high power density of 5 kW kg−1. These results provide a green and facile method to synthesize the electrode material from biomass for high-performance supercapacitors.
- Published
- 2021