Development and characterization of carbon-based doped modified electrodes

Electrochemistry is one of the important disciplines serving different application areas. This discipline, which is based on redox reactions related to oxidation and reduction, is frequently preferred due to the advantages it provides in areas such as qualitative and quantitative determination studies, energy applications and corrosion studies. Electrochemical studies are basically performed through an electrode called working. At this stage, other electrodes used according to the chosen method also contribute to the system. Modification of the working electrode is one of the most important steps to improve performance. Based on this information, in this thesis study, graphite electrodes were modified with carbon-based structures and the electrochemical behaviors of the final electrodes were examined by adding metal-based structures to the modified electrodes. Additionally, electroanalytical studies were carried out with these electrodes. In this context, in the first stage; pencil graphite electrodes (PGEs) were modified with acetylene black (AB), then polytryptophan was coated on these electrodes. Subsequently, metal-based structures were deposited on the coated electrodes by electrochemical methods using gold (Au), copper (Cu) and Au-Cu metal salts. Additionally, only polymer modified electrodes were also prepared. The responses of the created electrodes for hydrazine and folic acid were examined. The morphologies of the modified electrodes were examined by scanning electron microscopy (SEM), and their elemental compositions were examined by energy dispersive X-ray spectroscopy (EDX). Another characterization study included electrochemical methods, and cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used for this purpose. It has been determined that the carbon-based structures used to further improve the properties of the bare electrode and the metal-based doping made to these structures improve the electrochemical properties.