Fabrication of Low-Cost and Ecofriendly Porous Biocarbon Using Konjaku Flour as the Raw Material for High-Performance Supercapacitor Application

Low-cost and ecofriendly porous biocarbons were fabricated from lkonjaku flour via precarbonization and potassium hydroxide (KOH) activation. The obtained biocarbon ACK-5 derived from a precarbonized carbon/potassium hydroxide (KOH) mass ratio of 1:5 possessed an ultrahigh specific surface area of 1403 10 g4.1 and hierarchical porous structures with the existence of micro- to macropores. When AC(K)-S was employed as a supercapacitor electrode in 6 M KOH, it showed a high specific capacitance of 216 F g(-1) and excellent cycling stability with capacitance retention remaining 93.7% after 5000 cycles. Moreover, the ACK-5 sample acquired a supramaximal specific capacitance of 609 F g(-1), and the high energy density of AC(K)-5//AC(K)-5 symmetrical cells reached up to 9.2 Wh kg(-1) when p-phenylenediamine serving as a redox electrolyte was added into KOH electrolyte. The reported simple fabrication strategy would everage a green biomass precursor for the preparation of supercapacitors.