Preparation of highly porous binderless activated carbon electrodes from fibres of oil palm empty fruit bunches for application in supercapacitors

► Oil palm empty fruit bunches have been processed into supercapacitor electrodes. ► CO2 and KOH activations can produce highly porous binderless carbon electrodes. ► Small quantity KOH can reduce CO2 activation time significantly. ► Supercapacitors based on these electrodes exhibit excellence performances. ► Therefore this novel method offers a significant economic advantage.