Flexible all-solid-state supercapacitors are favored as the backup power of the portable and wearable electronic devices. With the unique advantages of large-area and flexibility of printed electronics, the manufacturing process of flexible electrodes can be greatly simplified. In this paper, activated carbon is used as active material and flexible supercapacitor electrodes are prepared by screen printing technology using activated carbon ink and conductive silver ink. Then, the flexible supercapacitor is assembled with the electrode coated with PVA-H₂SO₄ gel and the electrochemical properties are measured. The results show that the printed supercapacitor electrode can be successfully applied to flexible in-plane supercapacitors. The working voltage achieves 0.8 V and the areal specific capacitance of the whole device achieves 18 mF·cm^-2 at a charge-discharge current of 0.2 mA.

activated carbon  /  all solid state  /  printed electronics  /  supercapacitors