Abstract
In this study, CFs were coated electrochemically with three different monomers (An, EDOT or Py) in different condition such as electrolyte (BA, H 2 S0 4 or NaClO 4 ), solvent (H 2 O as inorganic medium or ACN as organic medium), in presence of foreign material (EBC) and coating method (constant potential and cyclic voltammetry as controlled potential). Obtained CFs were compared with regard to electrical and capacitive and morphological features. In CPE the current flown in system was changed in certain values for each monomer in presence of EBC. But this changing was more for Py than that for the other. In CV experiments, the oxidation potential was increased for PAn and PEDOT when it was decreased for Py. Imax values were changed for each polymer and conditions. According to Randles-Sevcik equation, the electrocoating redox processes in BA-H 2 O were not controlled by diffusion under this conditions. But, all the redox processes carried out in NaClO 4 -ACN electrolyte solution were controlled by diffusion for each polymer coated CFs. In presence of EBC it could be concluded that redox process was controlled by diffusion in BA-H 2 O for PAn and in NaClO 4 -ACN for PEDOT. In presence of 1.8 % EBC. The C DL value was decreased to 4 µF from 6 µF; to 0.7 µF from 1.5 µF; to 1 µF from 3 µF in BA-H 2 O for Pan, PEDOT and PPy respectively. But, it was increased to 11.5 µF from 10.4 µF in NaClO 4 -ACN for PEDOT. Phase angle was in the same trend. The texture coatings were more compact in the presence of EBC in electrolyte solution than that of the absence of EBC for PPy coated CF. The relationship of between the radius of coating and the C DL of the coated CF was proportional. Thus, it may be concluded that the C DL and radius of coating were affected with the presence of different material/compound in electrolyte solution. Keywords: PAn, PEDOT, PPy, presence of EBC, comparison, impedance, texture coating. DOI: 10.7176/CMR/13-3-05 Publication date: November 30 th 2021
Highlights
Carbon fibers (CFs) have properties such as high strength and modulus, good stiffness, and creep resistance etc
The Constant Potential Electropolymerization (CPE): To investigate the effect of different polymer on electrical behavior of CF, the CFs in form of brush were electrocoated with different polymers (PAn, PEDOT and PPy) at constant potential (1V) produced by a power supply in the same electrolyte medium
It was seen that all the redox processes carried out in NaClO4-ACN electrolyte solution were controlled by diffusion for each polymer coated CFs due to linear plot
Summary
Carbon fibers (CFs) have properties such as high strength and modulus, good stiffness, and creep resistance etc. The electron flow in the polymer chain is possible thank for this conjugation structure They are known as conducting polymers (CPs) due to their conducting features. The oxidation potential of EDOT monomer is shifted at lower values because of chain is more stable This stability is provided via the presence of the substituent containing electron-donating oxygen. We were aimed to investigate the electrical, capacitive and morphological features of the CF coated with different conducting polymers (PEDOT, PANI and PPy) and different electrolyte type (boric acid, BA, sulphuric acid, H2SO4 and sodium per chloride, NaClO4, epoxy) and different solvent type (acetonitrile, ACN and /or Pure water, H2O), comparatively. We found that these parameters were affected both capacitive and electrochemical properties of coated CF and that a proportional relationship was between the morphological and the capacitive features
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