Electrochemical study of galic acid on modified glassy carbon electrodes with carbon nanomaterials: contribution to the optimization of electroanalytical methods : diploma thesis

U ovom radu izvršena je modifikacija elektrode od staklastog ugljika sa različitim ugljikovim nanomaterijalima (grafen, elektrokemijski reducirani grafenov oksid, jednozidne ugljikove nanočestice, višezidne ugljikove nanočestice). Ispitano je elektrokemijsko ponašanje modificiranih i elektrokemijski funkcionaliziranih elektroda u prisutnosti galne kiseline u različitim puferima (acetatni pufer, Britton-Robison pufer, model otopine vina). Elektrokemijsko ponašanje galne kiseline u različitim puferima rađeno je metodama cikličke voltametrije i elektrokemijske impedancijske spektroskopije. Prikazan je utjecaj različite debljine sloja modifikatora i različitog broja ciklusa, kao i ovisnost visine anodnog strujnog pika o brzini posmika i njegovu korijenu u različitim puferima. Mjerenja su vršena pri različitim pH vrijednostima, te je utvrđena ovisnost ponašanja galne kiseline na različito pripremljenim elektrodama. Nakon provedenih mjerenja objašnjen je mehanizam elektrokemijskih reakcija, ponašanje elektroda u različitim puferima, te ograničenja i problemi vezani za elektrokemijsko ponašanje.In this paper was investigated a modification of a glassy carbon electrode with different carbon nanomaterials (graphene, electrochemically reduced graphene oxide, single-walled carbon nanoparticles, multi-walled carbon nanoparticles). The electrochemical behavior of modified and electrochemically functionalized electrodes in the presence of gallic acid in different buffers (acetate buffer, Britton-Robison buffer, wine solution model) was investigated. The electrochemical behavior of gallic acid in different buffers was performed by cyclic voltammetry and electrochemical impedance spectroscopy. The influence of different layer thickness of the modifier and different number of cycles is shown as well as the dependence of the anode current peak height on the shear rate and its root in different buffers. Measurments were performed at different pH values, and the dependence of galic acid behavior on differently prepared electrodes was determined. After the measurments, the mechanism of electrochemical reactions, the behavior of the electrodes in different buffers and the limitations and problems related to electrochemical behavior were explained