Compósitos de óxido de grafeno e polianilina obtidos “in situ” por via eletroquímica

Abstract

Due to the increased use of electric vehicles and the explosive growth of portable electronic devices, there has been an increase in the development of high-performance supercapac itors. In this context, the present research produced graphene oxide with PANI by the graphite exfoliation technique in an electrochemical cell. In this technique, graphite was used as an anode, H2SO4 1 M was used as an electrolyte, and the potential varied from 5 V to 13 V. The obtained material was characterized by Infrared Absorption Spectroscopy (FTIR), Thermogravimetric Analysis (TGA), UV-vis Spectroscopy, X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Cyclic Voltammetry (VC). The X-ray diffraction patterns indicate that the graphene oxide (GO) multilayers were exfoliated and adhered to the PANI chain. The presence and incorporation of PANI were confirmed from the SEM images, which show the OG well distributed in PANI with a nanowire format. The electrochemical performance of OG/PANI films and OG were investigated by cyclic voltammetry in 1 MH2SO4, presenting specific capacitance of 117.440 𝐹 𝑔−1 and 1.243 𝐹 𝑔−1 , respectively, at the rate of 1 𝑚𝑉 𝑠−1 scan. This increase can be attributed to the good distribution of electrical conductivity of PANI and graphene oxide. Thus, the results demonstrate the potential of the composite OG/PANI for application in high performance supercapacitors or other energy source system