Catálogo de Investigaciones 2015-2016

42 CIENCIAS An Electro Chemical Study Structure by Cyclic Voltammetry Cyclic Voltammetry is an electroanalytical technique that correlates the current at the working electrode versus the applied potential to obtain a cyclic voltammogram (CV) signal. CV serves as a fingerprint of the electrode surface. CV analysis obtained at precise values of sweep rate, electrode pretreatment, concentration and nature of the electrolyte leads to an affluence of information of the electrode surface composition and structure. In this project an electrochemical study of thin films gold electrodes was performed by recycling fragments of recovered thin-layer gold supported on glass by various sources. Electrode pretreatment procedures were performed to alter the microstructure of the electrode in order to achieve a reproducible surface. The formation of an oxide layer and its subsequent reduction and the electrochemical double layer region under defined experimental conditions are used as reference for checking in situ gold electrode surface status. The surface pretreatment produces reproducible blank signals of thin film gold electrodes in sulfuric acid solutions. CV can be used to both check the surface state at the mental solution interface and also to find out correlations between surface structure and applied potential. joelyan m. valles investigación especial subgraduada mentor: dra. margarita rodríguez lópez electro chemistry surface science cyclic voltammetry surface structure reactivity