Abstract:
Green Monoliths (GMs) of self-adhesive carbon grain from fibers of oil palm empty fruit
bunches were prepared by compression pressure at 1.43 × 107, 1.91 × 107 and 2.39 × 107 kg/m2,
respectively. Activated carbon monoliths ACM-A, ACM-B and ACM-C prepared by CO2
activation from these GMs, respectively, were used as electrodes in supercapacitor cells which
employed stainless steel 316L current collector and H2SO4 electrolyte. Evaluation of the
electrochemical properties showed that ACM-A, ACM-B and ACM-C cells had specific
capacitance of 30, 9 and 5 F/g, total ESR of 3.21, 4.95 and 7.33 Ω, specific power (maximum) of
173.41, 107.58 and 33.82 W/kg, and specific energy (maximum) of 0.67, 0.15 and 0.09 Wh/kg.
These properties are directly associated with the surface area of the ACMs, i.e. 419, 336 and 302
m2/g for the ACM-A, ACM-B and ACM-C, respectively, indicating a direct effect of compression
pressure on the physical and electrochemical properties of ACMs electrodes.
