Journal
JOURNAL OF POWER SOURCES
Volume 299, Issue -, Pages 519-528Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.09.039
Keywords
Synergy; Potassium carbonate; Active carbon; Fallen leaves; Supercapacitor
Funding
- National Natural Science Foundation of China [21076056]
- Chinese Ministry of Education [210010]
- Ph.D. Programs Foundation of Ministry of Education of China [20091317120005]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry
- Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT) [IRT1059]
- Hebei Provincial Key Lab of Green Chemical Technology & High Efficient Energy Saving, School of Chemical Engineering & Technology, Hebei University of Technology
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The active carbon materials (ACs) derived from fallen leaves (FLs) are prepared by the activations of mixed KOH and K2CO3. Characterizations reveal that the use of single activator KOH creates the most of micropores in three dimensional and K2CO3 produces the mesopores/macropores mostly in shallow. When combining KOH with K2CO3, the pore size of ACs is enlarged. The surface areas and hierarchical pore structures are related to the mass ratio of two activators. The electrochemical properties are monitored with the cyclic voltametry, charging-discharging and electrical impedance spectra. The prepared sample displays high specific capacitance of up to 242 F g(-1) (03 A g(-1), 6 M KOH) in a two-electrode system. Their good cycling stability with nearly no capacitance decrease is obtained after 2000 cycles. (C) 2015 Elsevier B.V. All rights reserved.
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