Supercapacitors attract great interest among researchers as energy storage devices due to
their high power capability and long cycle life. In this research, the electrochemical performance
of electrical double layer capacitor (EDLC) based solid bio-polymer electrolyte
(SBE) was studied. SBE consists of carboxymethyl cellulose (CMC) and ammonium nitrate
(NH4NO3) was prepared by solution casting technique. The electrical impedance spectroscopy
was used to verify the conductivity of SBE. The average conductivity was achieved
at ∼ 10−3 S/cm. This research aims to prepare SBE and apply in the fabrication of EDLC.
Scanning electron microscopy analysis showed the smooth and homogeneous surface of SBE
film without any phase separation, while irregular shape and sizes of particles was found
on the surface of electrode. Elemental identification results yielded that all corresponding
elements presence in the SBE and electrode. The EDLC performance was characterized
using galvanostatic charge-discharge at different constant currents. Charge-discharge studies
showed that long discharge time (90 minutes) within 11 cycle was observed at 2µA. The
highest specific capacitance of 1.8 F/g was discovered at 4µA. This study showed that EDLC
based SBE has a promising potential to be applied in low current applications.