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Activated carbons (ACs) are considered important electrode materials for supercapacitors because their large specific surface areas lead to high charging capacities. In the conventional synthesis of ACs, a substantial amount of carbon is lost during carbonization of a precursor. The development of a method to synthesize ACs in high yield would lower their manufacturing cost. Here, we demonstrate the synthesis of high-specific-surface-area NaOH-AC from carbon prepared via a hydrothermal carbonization (HTC) route, with a higher yield than that achieved through conventional pyrolysis carbonization. The amorphous carbon was derived from HTC of sugar and subsequently activated at 800C with various NaOH etchant/C ratios under a N2 atmosphere. The AC prepared at 4:1 NaOH/C exhibited the highest surface area (as high as 2,918 m g) and the highest specific capacitance (157 F g in 1 M aqueous Na2SO4 electrolyte solution) among the NaOH-AC samples prepared in this work. On the basis of their high specific capacitance, the NaOH-ACs prepared from HTC sugar are suitable for use as electrode materials for supercapacitors.

New High-Yield Method for the Production of Activated Carbon Via Hydrothermal Carbonization (HTC) Processing of Carbohydrates