KOH-assisted microwave post-treatment of activated carbon for efficient symmetrical double-layer capacitors

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Copyright © 2016 John Wiley & Sons, Ltd. It is important to tune the surface and pore structures of carbon materials for their application in capacitors. Herein, a novel microwave-based approach is demonstrated to significantly increase the capacity of a supercapacitor. After activated carbon (AC) with KOH was treated by microwave heating only for 8 min, its symmetrical double-layer capacitor increased from 68.6 to 107.9 F/g at current density of 0.2 A/g with 2 M KOH aqueous solution. The excellent capacity retention of 96% was obtained even after 4000 galvanostatic charge/discharge cycles at current density of 5 A/g. This microwave approach is much more efficient than the conventional heating process to tune the electrochemical properties of AC. Copyright © 2016 John Wiley & Sons, Ltd.

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International Journal of Energy Research