Flexible ultrathin micro-supercapacitors based on laser-reduced graphene with superior electrochemical performance and aesthetic property

Abstract

Supercapacitors with an outstanding electrochemical performance have emerged as a rapidly rising star on the horizon of energy storage devices and consumer electronics applications. With the rapid development of miniaturized and portable electronic technology, flexible ultrathin micro-supercapacitors have become more important than ever. The 2D network structure of graphene oxide (GO) with excellent mechanical and electrochemical performances has been reduced into reduced graphene oxide (rGO) by a pulse laser, which is a competitive candidate for the preparation of micro-planar supercapacitors. Micro-supercapacitors based on laser-reduced graphene with an ultrathin thickness of 20 µm exhibit a very high area capacitance up to 4.8 mF/cm2 at a current density of 0.3 mA/cm2 in LiCl-PVA gel electrolyte. Additionally, the energy storage device can possess a fantastic aesthetic property by virtue of the laser technology, which not only reveals the aesthetic art side of supercapacitors, but also provides a palette for the state-of-the-art micro-supercapacitors.