Electrolyte free and flexible micro-supercapacitors based on PET fabric

The present research developed a new electrolyte free and flexible micro-supercapacitor (MSC)based on polyethylene terephthalate (PET) fabric as a new kind of wearable electronic device.Laser scribing, based on its ability regarding to pattering and reducing at the same time is used asa reduction source on the thermally sensitive underneath such as polymer or textiles. The aspreparedlaser patterned devices (rGO-GO-rGO) show good electrochemical performancewithout the use of any external electrolyte (Figure 1). Due to the uncertainty in the measurementof the exact mass of the laser reduced active electrode material, we will mostly report thecapacitance values in area density mF/cm2 units. In comparison, a well-designed recentlyreported, inkjet-printed carbon supercapacitor, with inter-digitated electrode structure and similarelectrode thickness showing that the performance of our device without external electrolyte is inthe same range as reported for other systems. The electrochemical performances show the almostgood activity of devices without any electrolytes. The capacitance is measured in different scanrates from 5 mv/s up to 40 mv/s.The interaction between the trapped water and GO layers is a keyto the ionic conductivity observed here. At low concentration, H2O molecules bind to GO sheetsvia strong intermolecular interaction (hydrogen bonding); as the water content increases, theactive sites on GO sheets get saturated, and the excess water molecules become free to rotate anddiffuse. The protons, which are the species here taking part in ionic conduction, come from thehydrolysis of the functional groups (carboxyl, sulfonic and/or hydroxyl) present on GO, and theresulting protons can move via Grotthuss Mechanism, which is hopping via hydrogen bondingnetwork, or even freely migrate in the hydronium form (H3O+) within the intralayer spaces

کلیدواژه ها:

Wearable ، Supercapacitor ، Reduced graphene oxide ، Laser ، Polyethyleneterephthalate