Nor, Najah Syahirah MohdDeraman, MohamadOmar, RamliAwitdrusFarma, RakhmawatiBasri, Nur HamizahDolah, Besek Nurdiana MohdMamat, Nurul FatinYatim, BaharudinDaud, Mohd Norizam Md2015-08-182015-08-182015-08-18wahyu sari yenihttp://www.sciencedirect.com/science/article/pii/s0360544214012560http://repository.unri.ac.id/xmlui/handle/123456789/7506Carbon-monolith electrodes for supercapacitors were prepared from GMs (green monoliths) made from pre-carbonized fibers of oil palm EFB (empty fruit bunches) and GMs of pre-carbonized EFB fibers exposed to gamma radiation at 5 kGy, 15 kGy, and 20 kGy. GMs and irradiated GMs were carbonized and activated to prepare ACM (activated-carbon-monolith) electrodes. The gamma radiation affected the pore structure of the ACM electrodes and the electrochemical performance of the supercapacitors; irradiation doses of 0 kGy, 5 kGy, 15 kGy and 20 kGy produced specific capacitances of 121 F g 1, 196 F g 1, 11 F g 1, and 12 F g 1, respectively. The irradiation dose of 5 kGy appears to be optimum and produces a specific power and specific energy of 236 W kg 1 and 5.45 W h kg 1, respectively, representing 34% and 60% increases over ACM electrodes prepared from non-irradiated GMs.enSupercapacitor Gamma irradiation Carbon electrode Specific power Specific energyUR-Scientific Work Lecturer