Composites based on graphite plate/polypyrrole and graphite plate/polypyrrole/graphene applied to supercapacitors

• Grant number: 18/18350-1
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Effective date (Start): June 01, 2019
• Effective date (End): March 31, 2021
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
• Principal Investigator: Maurício Ribeiro Baldan
• Grantee: Bárbara da Silva Pinheiro
• Host Institution: Instituto Nacional de Pesquisas Espaciais (INPE). Ministério da Ciência, Tecnologia e Inovações (Brasil). São José dos Campos , SP, Brazil

Abstract

This work consists of preparing and characterizing composites binary based on graphite plate (GP), polypyrrole (Ppy) and graphene oxide (GO) for their applications as high-performance energy storage and conversion devices. Currently, this type of technology is of great interest because it provides the demand for devices with better functional performance and the growing need for greater energy security. In this work, GP is used as substrate in the preparation of these composites because it is a material with excellent properties for supercapacitor applications, such as high electrical conductivity and electrochemical stability. The use of Ppy and GO materials as interface in the preparation of these composites is based on their excellent properties, aiming to increase the energy storage capacity due to the increase of the specific capacitance and the electrical conductivity presented by these materials. The experimental procedure consists of the preparation of GP/Ppy binary composites and GP/Ppy/OG ternary composites for the purpose of a comparative study and also of interface analysis. GP /Ppy binary composites are obtained by chemical polymerization of pyrrole on GP substrate, while GP/Ppy /OG composites are prepared by the chemical co-deposition and electrophoretic of Ppy/OG on GP substrate. The composites will be evaluated by electrochemical techniques to characterize the range of potential available for a charge of the electric double layer, charge density, nature of the capacitive process and redox processes. Raman Spectroscopy, X-Ray Diffraction Spectroscopy (XRD), Fourier Transform Infrared Spectroscopy (FT-IR) will be used for structural analysis and Field Emission Scanning Electron Microscopy (SEM-FEG), for morphological analysis. Finally, the performance of the studied energy system will be evaluated as a function of the specific capacitance, the charging/discharging rate, the power and energy density and the stability of the life cycle.