Biosourced Foam‐Like Activated Carbon Materials as High‐Performance Supercapacitors

Bio‐inspired and cost‐effective development of highly porous foam‐like carbon structure originating from waste fig‐fruit raw materials using chemical activation is described. The as‐synthesized porous sample exhibits a specific surface area higher than 2000 m 2 g −1 and relatively high porosity with ultimately interconnected micro‐, meso‐, and macropores. Such sample displays superior specific capacitance in aqueous electrolyte of 340 and 217 F g −1 at current density of 0.5 A and 20 A g −1 , respectively, along with a high energy/power density performance compared to that developed in the literature and the commercial supercapacitors up to now. In addition, the sample also exhibits an extremely high stability as a function of cycling tests with more 99% capacitance retention after 10 000 cycles.