1School of Chemistry & Chemical Engineering, Shaanxi Normal University, 620 West Chang'an Avenue, Xi'an, 710119 P.R. China
2State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, 27 South Taoyuan Road, Taiyuan, 030001 P.R. China
Tóm tắt
AbstractHierarchical 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 °C possesses a high surface area of 3639 m2 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 F g−1 at a current density of 0.5 A g−1 in 6 M KOH aqueous solution. In addition, it shows an impressive energy density of 60.8 Wh kg−1 at a power density of 10416.7 W kg−1 in the ionic liquid BMIMBF4. Particularly, a high electrochemical stability and an excellent reversibility were observed in both aqueous and non‐aqueous electrolytes.
