Manufacture and Measurement of Graphene-based Supercapasitor Electrodes and Characterization using Charging-discharging Method

: Supercapacitors or known as EDLCs (Electrochemically double-layer Capacitors) are electric double layers separated by separators. Supercapacitors provide very high power density values, long repetition cycles and have a higher repetition efficiency compared to batteries. This study aims to design a supercapacitor with a material of 0.905 gram graphene powder, 2 gram activated carbon, epoxy resin (3 spoonfuls of spatula), Phosphoric Acid (H 3 PO 4 ) electrolyte solution, and aluminum plate with a size of 8 cm x 8 cm, 6 cm x 6 cm, and 5 cm x 5 cm as collector media. The research was carried out in four stages, namely mixing graphene powder and epoxy resin, coating graphene-epoxy resin powder on both plates, sowing activated carbon on the surface of the plate, and combining the two plates into one supercapacitor section. The test results show that with the charging-discharging method, the size of 8 cm x 8 cm which is carried out charging for 3 minutes can store a voltage of 1.65 Volt, on the size of 6 cm x 6 cm done charging for 3 minutes can store a voltage of 1.44 Volt, and at a size of 5 cm x 5 cm by charging for 3 minutes can store a voltage of 1.05 Volt. So it can be proven that the cross-sectional area of a supercapacitor greatly influences the value of the stored voltage.