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We have developed a flexible, interdigitated supercapacitor with high energystoring capacity for wearable, flexible electronic application. Locallyobtained low cost biomass (banana peel) was impregnated with KOH under hightemperature under an inert atmosphere to synthesize activated carbon withsignificant Brunauer Emmett Teller surface area of 62.03m2/g. Thesupercapacitor was fabricated by screen printing interdigitated currentcollector of conducting silver ink on a thin flexible PET substrate andsubsequent deposition of activated carbon and drop casting of gel electrolyte.Fabricated supercapacitor exhibits high capacitance of 33.18 mF/cm2 at 1mV/sscan rate and 20.12 mF/cm2 at a discharge current of 1mA and high energydensity of 5.87 micro Wh/cm2. The developed flexible supercapacitor retains itsenergy storing capacity (90%) over several cycles of mechanical bending andrepetitive electronic cycling tests (5000 cycles). Locally available biomassbased activated carbon and low cost screen printing technique can be used forlarge scale fabrication of supercapacitor. The flexible supercapacitordemonstrates high energy storing capacity and mechanical durability throughmultiple bending and charging and discharging through LED. Therefore, it can beused for further developing integrated wearable and printed electronic devices.

Interdigitated flexible supercapacitor using activated carbon synthesized from biomass for wearable energy storage