Compósitos de óxido de grafeno auto-estruturado, carbon black e polianilina aplicados como eletrodos para supercapacitores.

Abstract

In the face of diverse and intermittent renewable energy generation, energy storage is a crucial factor in the global energy transition to manage and distribute it continuously. In this context, it is important to devise an efficient, sustainable, and financially viable device. This work presents the synthesis and study of self-structured graphene oxide composites, known as aerographene, acting as a positive electrode for supercapacitors. The study considered the incorporation of carbon black and polyaniline in the emeraldine phase. Four types of syntheses were carried out, and the composites were evaluated in terms of carbon/additive ratio and thermal treatment. The materials were morphologically characterized by SEM and TG and electrochemically characterized by Cyclic Voltammetry and Charge and Discharge. The results obtained showed that the aerographene composite with polyaniline in a 1:3 ratio obtained the best performance, with a capacitance approximately 4 times higher than the others, reaching a value of 2,255.49 F·g^(-1) at a scan rate of 2 m·V·s^(-1), within a potential window of 0.65V. Therefore, the incorporation of polyaniline confirmed the superior capacitive performance in energy storage. Showing that the composite is a promising material to be explored in storage device technologies, specifically, supercapacitors.

Keywords: aerographene, reduced graphene oxide, polyaniline, PANI, supercapacitors.