Abstract
Hierarchical porous carbon was fabricated from low-cost starch by the Na2CO3 template method followed by KOH activation. Structural characterization indicates that the porous carbon with a high specific surface area (1034m2/g) is made up of interconnected micro-, meso-, and macropores. Electrochemical measurements show that it exhibits a high specific capacitance of 234F/g at 2A/g, good rate capability with a retention of 91% at 20F/g, and good cycling performance with 98% retention over 1000 cycles at 2A/g in 6M KOH electrolyte, which makes it a promising electrode for high-performance electrochemical energy storage system.
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