Electrosynthesis of Polyaniline on Carbon Fiber Felt: Influence of Voltammetric Cycles on Electroactivity

Author(s)

dos Santos Poli, Anne Karoline ^[1] ; Domingues Caetano, Gustavo Machado ^{[2, 3]} ; Vargas, Ludmila Resende ^[1] ; Gama, Adriana Medeiros ^[2] ; Baldan, Mauricio Ribeiro ^{[1, 4]} ; Goncalves, Emerson Sarmento ^{[2, 1]}

Affiliation

^[1] Inst Tecnol Aeronaut, Praca Marechal Eduardo Gomes, BR-12228900 Sao Jose Dos Campos, SP - Brazil

^[2] Inst Aeronaut & Espaco, Lab Caracterizacao Fis Quim, Div Mat, Praca Marechal Eduardo Gomes, BR-12228904 Sao Jose Dos Campos, SP - Brazil

^[3] ETEP Fac, BR-12000000 Sao Jose Dos Campos, SP - Brazil

^[4] Inst Nacl Pesquisas Espaciais, Lab Associado Sensores, BR-12227010 Sao Jose Dos Campos, SP - Brazil

• Document type: Journal article
• Source: Journal of the Electrochemical Society; v. 164, n. 9, p. D631-D639, 2017.
• Web of Science Citations: 1

Abstract

The carbon materials and conducting polymers are known by application in electronic devices. This work aims to study the initial steps parameters of polyaniline electrosynthesis on carbon felts annealed at 1600 K by changing the number of voltammetry cycles in aniline acid solution. The characterization was performed by Field Emission Gun - Scanning Electron Microscopy, X-ray Diffraction, Infrared Fourier Transform Spectroscopy, Raman Spectroscopy and Electrochemical Impedance Spectroscopy. Under increasing number of cycles, the growth was more intense and it was easy to observe the pores clogging. Besides, it was noticed that emeraldine formation occurred progressively, from structures less to more oxidized: the polyaniline less cycled resulted closest that leucoemeraldine; polyaniline from nine cycles resulted closest to emeraldine, but all of them showed electroactive defects related to electrical charge (polarons) and conductivity (bipolarons). It was also observed that prime layers of polyaniline, formed until three cycles, followed more intense attraction of charges in solution to layer surface. This effect was emphasized from 3rd to 6th cycles. (C) 2017 The Electrochemical Society. (AU)

• FAPESP's process: 16/11462-3 - Optimization and Systematisation of Polianilin processing and obtation for application in energy storage and electromagnetic filters
• Grantee: Maurício Ribeiro Baldan
• Support Opportunities: Regular Research Grants