Nanostructured Polyaniline/Graphene/Fe<sub>2</sub>O<sub>3</sub> Composites Hydrogel as a High-Performance Flexible Supercapacitor Electrode Material
Anjli Gupta, Silki Sardana, Jasvir Dalal, Sushma Lather, Anup Singh Maan, Rahul Tripathi, R. Punia, Kuldeep Singh, Anil Ohlan
Abstract
In recent years, the demand for high-performance flexible and portable electronics with high power/energy density has increased rapidly. Currently, the flexible devices have seized the interest of researchers in energy storage especially, supercapacitors and batteries. Working on the same line, ternary nanostructured polyaniline/Fe2O3-decorated graphene (PGF) composite hydrogel coated on carbon cloth has been prepared as a potential electrode material for flexible supercapacitor. Different compositions of aniline to Fe2O3-decorated graphene have been synthesized by in situ chemical oxidative polymerization. The ternary composite hydrogel on carbon cloth exhibits a high specific capacitance of 1124 F/g at a current density of 0.25 A/g in 1 M H2SO4. The symmetrical supercapacitor has shown high rate capability (∼82.2% at 7.5 A/g) as well as excellent cycling stability. The excellent electrochemical performance of ternary composites hydrogel have been realized because of the well-designed cross-linked hydrogel structure, high surface area, and synergistic effects among all three constituents. This outstanding performance holds great potential for next-generation flexible supercapacitors.