Electrochemical impedance spectroscopy correlation among graphene oxide/carbon fibers (GO/CF) composites and GO structural parameters produced at different oxidation degrees

Author(s)

Sardinha, Andre F. ; Almeida, Dalva A. L. ; Ferreira, Neidenei G.

• Document type: Journal article
• Source: JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T; v. 9, n. 5, p. 10841-10853, SEP-OCT 2020.
• Web of Science Citations: 0

Abstract

Graphene oxide (GO) with different oxidation degrees was systematically studied. This approach took into account GO synthesis with five oxidation degrees using 2.0, 2.5, 3.0,4.0, and 5.0 g of oxidizing agent for each 1.0 g of graphite. The oxidation degree control provided surface functional group changes indicating the proper interaction between the carbon fiber (CF) surface and GO deposit. GO samples were structurally and physically evaluated by Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, and X-ray diffraction measurements. Mildly chemically oxidized CF was used to produce five different composites GO/CF analyzed by electrochemical impedance spectroscopy measurements (EIS). GO structural results showed well-corroborated data for the GO4.0 samples. EIS responses also aggregated important information associated with the composite charge transfer resistances as well as to their capacitive behaviors. (C) 2020 The Author(s). Published by Elsevier B.V. (AU)

• FAPESP's process: 17/10118-0 - Study and application of electrochemical technology for the analysis and degradation of endocrine interferents: materials, sensors, processes and scientific dissemination
• Grantee: Marcos Roberto de Vasconcelos Lanza
• Support Opportunities: Research Projects - Thematic Grants