Cherry stones as precursor of activated carbons for supercapacitors

It is shown that cherry stones-wastes can be recycled as activated carbons for electrode material in supercapacitors. KOH-activation of this precursor at 800-900oC is an efficient process to obtain carbons with large specific surface areas (1100-1300 mg), average pore sizes around 0.9 to 1.3 nm, which makes them accessible to electrolyte ions, and conductivities between 1 and 2 S cm. These features lead to capacitances at low current density as high as 230 F g in 2M H2SO4 aqueous electrolyte and 120 F g in the aprotic medium 1M (C2H5)4NBF4 / acetonitrile. Furthermore, high performance is also achieved at high current densities, which means that this type of materials competes well with commercial carbons used at present in supercapacitors.