Influence of heat treatment and electrochemical treatment on the properties of PANI electrodeposited on carbon fiber felt

Author(s)

Hilario, Rodrigo Barbosa ; de Moraes, Thales Henrique ; da Rocha Pimentel Goncalves, Joseane Mercia ; Gandara, Meriene ; Goncalves, Emerson Sarmento

• Document type: Journal article
• Source: DIAMOND AND RELATED MATERIALS; v. 123, p. 18-pg., 2022-03-01.

Abstract

Energy storage devices such as supercapacitors with flexible electrodes are used in new technologies of the modern printed electronics system. These flexible energy stores can power systems containing chips, microcontrollers and others. For the development of these flexible electrodes, carbon fiber felt (current collector) with polyaniline (active material) form a composite material with high performance of transport and storage of charges, lightness and flexibility. So, to obtain an electrochemical performance of the electrode, in this work the carbon fiber surface was modified by thermal and electrochemical treatment (insertion of heteroatoms of oxygenated groups in the fiber) to enhance conductivity and the anchor of the polyaniline, respectively. After the carbon fiber felt underwent heat treatment at temperatures of 1250 degrees C, 1500 degrees C and 1900 degrees C, half of the fiber felt samples underwent a chronoamperometric activation process in a sulfuric acid at 1 mol L-1. Subsequently, polyaniline was electrodeposited onto the fibers via square wave voltammetry, and the materials were characterized by: scanning electron microscopy (SEM), X-ray diffraction (XRD), cyclic voltammetry (CV), electrochemical impedance spectrometry (EIS) and Raman scattering. The composite in which the fiber was thermally treated at 1250 degrees C without electrochemical activation obtained a specific capacitance of 386.6 F g(-1). The carbon fiber treated at higher temperature (1900 degrees C) and with electrochemical functionalization, obtained improved electrolyte/electrode interaction, which favored the PANI electrodeposition and specific capacitance (345.1 F g(-1)). (AU)

• FAPESP's process: 19/27394-5 - High performance porous carbon accumulators for energy support for complex hubs powered by water desalination system
• Grantee: Emerson Sarmento Gonçalves
• Support Opportunities: Regular Research Grants
• FAPESP's process: 21/10830-7 - Obtaining and characterization of two-dimensional ceramic material (MXenes) electrodes for application in capacitive deionization and related energy storage systems
• Grantee: Meriene Gandara
• Support Opportunities: Scholarships in Brazil - Technical Training Program - Technical Training