Journal
CHEMELECTROCHEM
Volume 5, Issue 11, Pages 1451-1458Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.201800305
Keywords
biomass; energy storage; hierarchical porous carbon; poplar anthers; supercapacitor
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Funding
- National Basic Research Program [2012CB626806]
- National Natural Science Foundation of China [21227002, 21573270, 21273264, 21273263]
- Natural Science Foundation of Shanxi Province of China [2013021007-3, 2015021003]
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Hierarchical porous carbons with granular shape were prepared from waste biomass poplar anthers (PA) by pre-carbonization and following KOH activation. The pore structure and surface chemistry of PA-derived carbon can be controlled by adjusting the activation temperature. The material activated at 800 degrees C possesses a high surface area of 3639 m(2)g(-1), abundant mesopores, and appropriate amounts of oxygen- and nitrogen-containing species. As a result, it exhibits excellent electrochemical performances as a supercapacitor electrode. The specific capacitance reaches 361.5 Fg(-1) at a current density of 0.5 Ag-1 in 6 M KOH aqueous solution. In addition, it shows an impressive energy density of 60.8 Whkg(-1) at a power density of 10416.7 Wkg(-1) in the ionic liquid BMIMBF4. Particularly, a high electrochemical stability and an excellent reversibility were observed in both aqueous and non-aqueous electrolytes.
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