期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 834, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.155115
关键词
Porous carbon; Biomass; Reconstruction; Supercapacitor; Power density
资金
- National Natural Science Foundation of China [21671166, U1703251]
- Scientific Research Program of the Higher Education Institution of Xinjiang [XJEDU2018Y003]
- Xinjiang Tianchi Doctoral Project
- Program for Tianshan Innovative Research Team of Xinjiang Uygur Autonomous Region [2018D14002]
Suffering from the stable intrinsic structure and strong cross-linking between cellulose, hemicellulose, and lignin, the strategy of directional editing of biomass pore structure is rare. Here, we develop a simple hydrothermal strategy to reconstruct the macroporous biomass precursor to obtain interconnected and hierarchical porous carbon. Benefiting from its interconnected and hierarchical micro/meso/macroporous structure, high mesopore ratio of 74%, large surface area of 2690 m(2) g(-1), and abundant surface heteroatom (O, N, S), the resulting carbon performs an ultrahigh capacitance of 328 F g(-1) at 1 A g(-1), outstanding rate performance with a high capacitance retention of 60% at 100 A g(-1), as well as good cycle stability in two-electrode system in 6 M KOH. Importantly, the resulting carbon also exhibits high areal capacitance of 4.1 F cm(-2) at 1 A g(-1) under a high mass loading of 20 mg cm(-2) due to the robust ion-transfer kinetics. Furthermore, superior energy densities of 46.7 Wh kg(-1) at 622 W kg(-1) and 25.8 Wh kg(-1) at 27.3 kW kg(-1) are achieved in neat EMIM BF4. (c) 2020 Elsevier B.V. All rights reserved.
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