Аннотация:Rice hull ash (RHA) produced commercially by burning hulls of rice growing in the KrasnodarKrai, Russia, is characterized by a series of modern physicochemical investigation methods. The RHA isshown to contain amorphous silica (>70 wt %) and carbon (~8 wt %). Activated carbon (AC) is prepared byprocessing RHA with an alkali solution followed by annealing at 700C. The specific surface area of AC is1442 m2 g–1, with mesopores dominant in its structure. The AC is used as an electrode material in fabricatingdouble-layer supercapacitors (EDLCs) containing an aqueous 6M KOH electrolyte or an organic 1MEt4NBF4/PC electrolyte. The energy storage capacity of studied EDLCs are 299 F g–1 and 131 F g–1, respectively.