期刊
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
卷 14, 期 5, 页码 4034-4046出版社
ESG
DOI: 10.20964/2019.05.42
关键词
High-performance; Chitosan; Hierarchical pores; Pyrolysis; KOH activation
资金
- International Cooperation Foundation of Qilu University of Technology [QLUTGJHZ2018023]
- International Intelligent Foundation of Qilu University of Technology [QLUTGJHZ2018024]
Chitosan, a renewable biomass derivative, was used as electrode material with a facile pyrolysis and activation process for supercapacitors. The physical and electrochemical performances of the as-prepared chitosan-based hierarchical porous carbon (CHPC) were evidently affected by the mass ratio of powder to KOH and the carbonization temperature. The sample obtained at the best powder/KOH ratio of 1:1 exhibits meaningful structural characteristics: optimized interconnected hierarchical pore structure and high specific surface area (863.58 m(2) g(-1)). It possesses excellent capacitive property with high specific capacitance of 310 F g(-1) in 6 mol L-1 KOH electrolyte at a current density of 1 A g(-1), and enhanced rate capability (231 F g(-1) can be retained at 10 A g(-1)). Additionally, it shows excellent capacity retention of 80% after 10 000 cycles at 10 A g(-1). The efficiently combined and optimized synthesis process and the excellent electrochemical characteristics are of strategic guiding significance to the large-scale application of high-performance supercapacitors.
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