Facile Fabrication of Flexible In-Plane Graphene Micro-Supercapacitor via Flash Reduction

Abstract

Flash reduction of graphene oxide is an efficient method for producing high quality reduced graphene oxide under room temperature ambient conditions without the use of hazardous reducing agents (such as hydrazine and hydrogen iodide). The entire process is fast, low‐cost, and suitable for large‐scale fabrication, which makes it an attractive process for industrial manufacturing. Herein, we present a simple fabrication method for a flexible in‐plane graphene micro‐supercapacitor using flash light irradiation. All carbon‐based, monolithic supercapacitors with in‐plane geometry can be fabricated with simple flash irradiation, which occurs in only a few milliseconds. The thinness of the fabricated device makes it highly flexible and thus useful for a variety of applications, including portable and wearable electronics. The rapid flash reduction process creates a porous graphene structure with high surface area and good electrical conductivity, which ultimately results in high specific capacitance (36.90 mF cm−2) and good cyclic stability up to 8,000 cycles.