Ternary Nanocomposites of Reduced Graphene Oxide, Polyaniline, and Iron Oxide Applied for Energy Storage
Vitor H. N. Martins, Nicolás M. S. Siqueira, Jéssica E. S. Fonsaca, Sergio H. Domingues, Victor H.R. Souza
Abstract
This work states the preparation of ternary composites of reduced graphene oxide/polyaniline/iron oxide as free-standing and flexible thin films using a simple doctor blade technique. We optimized the properties of the films for further studies as an electrode in a symmetric all-solid supercapacitor. Adding polyaniline into the composites is imperative to produce free-standing films with no binder and conductive additive, besides improving the energy storage performance along with iron oxide. The ternary free-standing film exhibited a specific capacitance of 281 F g–1 in the three-electrode system and a specific capacitance of 24 F g–1 in the all-solid supercapacitor, including a good long-term stability of 76% and excellent Coulombic efficiency ranging from 92 to 166% after 3000 cycles at 3 A g–1. The performance of these free-standing ternary composites prepared using the same method applied in commercial supercapacitors may offer a perspective to its large-scale application in energy storage systems.