كليدواژه :
Wearable , Supercapacitor , Reduced graphene oxide , Laser , Polyethylene terephthalate
چكيده فارسي :
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 as
a reduction source on the thermally sensitive underneath such as polymer or textiles. The asprepared
laser patterned devices (rGO-GO-rGO) show good electrochemical performance
without the use of any external electrolyte (Figure 1). Due to the uncertainty in the measurement
of the exact mass of the laser reduced active electrode material, we will mostly report the
capacitance values in area density mF/cm2 units. In comparison, a well-designed recently
reported, inkjet-printed carbon supercapacitor, with inter-digitated electrode structure and similar
electrode thickness showing that the performance of our device without external electrolyte is in
the same range as reported for other systems. The electrochemical performances show the almost
good activity of devices without any electrolytes. The capacitance is measured in different scan
rates from 5 mv/s up to 40 mv/s.The interaction between the trapped water and GO layers is a key
to the ionic conductivity observed here. At low concentration, H2O molecules bind to GO sheets
via strong intermolecular interaction (hydrogen bonding); as the water content increases, the
active sites on GO sheets get saturated, and the excess water molecules become free to rotate and
diffuse. The protons, which are the species here taking part in ionic conduction, come from the
hydrolysis of the functional groups (carboxyl, sulfonic and/or hydroxyl) present on GO, and the
resulting protons can move via Grotthuss Mechanism, which is hopping via hydrogen bonding
network, or even freely migrate in the hydronium form (H3O+) within the intralayer spaces.
