A Simple and Scalable One-Pot Chemical Reduction and Functionalization of Reduced Graphene Oxide Films for Flexible Supercapacitor Applications

Abstract

This study presents a one-pot, low-cost, and scalable method for preparing chemically Reduced Graphene Oxide Films (RGOFs) doped with iodine groups for supercapacitor applications. The Graphene Oxide Film (GOF) was first fabricated via a simple solution-casting technique, followed by chemical reduction using Hydriodic acid (HI) as the reducing agent. The as-prepared GOF and RGOF were thoroughly characterized in terms of their electrical, mechanical, morphological, and structural properties using appropriate analytical techniques. Results indicate that GOF was successfully reduced and functionalized with iodine groups. When tested as supercapacitor electrodes, the films demonstrated nearly ideal capacitive characteristics, delivering a high specific capacitance of ~ 380 F·g^-1. Furthermore, they maintained good cyclic stability, preserving nearly 98% of their initial capacitance after 4,000 charge/discharge cycles. These promising results highlight the potential of these films as cost-effective and scalable candidates for next-generation high-performance flexible supercapacitors.