The advances in micro-size and in-plane supercapacitors lead to produce the miniaturizing energy storage devices in portable and bendable electronics. Micro-supercapacitors have the unique electrochemical performance, such as high power density, fast charging, long cycle life and high safety. The reduction time and cost in fabrication processes of micro supercapacitors are important factors in micro-fabrication technology. In this work, a simple, scalable and cost-effective fabrication of interdigitated reduced graphene oxide@polyaniline flexible micro supercapacitors is presented. We found that in fabricating the interdigitated micro electrode patterns on PET substrate; the reduction of graphene oxide and growth of conducting polymer are rapidly performed simultaneously in one step by laser irradiation. The capacitance was 72 mF/cm 2 at 35µA/cm 2 current density. These highly capacitance micro supercapacitors demonstrate good stability and more than 93.5% of the capacitance retain after 1000 cycles at 0.7 mA/cm 2 current density.

No abstract

Flexible supercapacitors (SCs), with a guideline of future perspective as one of the emerging energy storage devices, are facing key challenges for producing imminent portable and bendable electronic devices. Some of these challenges are the rational architecture of supercapacitors and the preparation of highperformance active materials. Herein, we used a simple, environmentally degradable, and scalable approach for the design and fabrication of interdigitated and sandwich electrodes. The active material of planar and sandwich-type supercapacitors and reduced graphene oxide@polyaniline nanocomposites were prepared by the hydrothermal method and directly drop-cast on the poly(ethylene terephthalate) (PET) substrate as supercapacitor electrodes. In this method, although we did not use mechanical press, active materials possess excellent adhesion to the substrate. The capacitance of our prepared planar supercapacitor was 99 F/g at a 0.5 mA current and demonstrated good stability after 1000 cycles at a 5 A/g current density; the capacitance retention rates remained over 98.3%. Our prepared sandwich-type supercapacitors showed a low charge transfer resistance (R ct = 1.75 Ω) and achieved a capacitance retention of 83% when the current density changed from 0.25 to 5.0 A/g. These reveal their promising potential for highperformance supercapacitor applications in future electronic productions.

No abstract

No abstract