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Estudios cinéticos de la reacción de reducción electroquímica de oxígeno sobre electrodos metálicos

Mauricio Damián Arce José Luis Fernández Mariana Isabel Rojas Gabriel Ángel Planes Javier Mario Grau Paola Mónica Quaino

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The present thesis work covers different aspects related to the kinetics of the oxygen reduction reaction (orr), with the aim to provide new knowledge concerning to the understanding of one of the main reactions in the electrochemistry field. In particular, the studied materials cover the noble metal group. The principal tool used for the orr study consists of systems with high mass transport rates, as a consequence, several synthesis and characterization methods were developed for the fabrication of microelectrodes (MEs). In order to be able to interpret the results, a rigorous kinetic model was proposed, which takes into account the different reaction routes. The deduced equations were used for simulation and fitting of polarization curves for the orr, which allowed for the access of the kinetic elemental parameters that governs the reaction for each material. Bimetallic electrodes were also studied, being a very interesting configuration taking into account that some metal combinations present an enhancement in the electrocatalytic response towards the orr (synergetic effect). In this case, besides the conventional techniques applied to the MEs, the study was complemented with theoretical quantum calculations using the Density Functional Theory (DFT). This provides information about the structural and electronic modifications on the electrode material with the different intermediate species involved in the reaction mechanism. The experimental and theoretical results allow to have a comprehensive idea of the synergetic mechanism between the materials.
Palabras clave – provistas por el repositorio digital

Reacción de reducción de oxígeno; Celdas de combustible; Metales nobles; Microelectrodos; Teoría del funcional densidad; Oxygen reduction reaction; Fuel cells; Noble metals; Microelectrodes; Density functional theory

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No requiere 2014 Biblioteca Virtual de la Universidad Nacional del Litoral (SNRD) acceso abierto

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Tipo de recurso:

tesis

Idiomas de la publicación

  • español castellano

País de edición

Argentina

Fecha de publicación