Estudio de la reacción de reducción electroquímica de CO2 sobre electrodos sólidos modificados con Poli-(3,4-etilendioxitiofeno) (PEDOT) Poli-(3,4-etilendioxitiofeno) (PEDOT)
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Molina Osorio, Andres Felipe
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En este trabajo se presentan los resultados del estudio de la reducción electroquímica de CO2 en medio acuoso, CH3CN y mezclas de CH3CN:H2O ricas en CH3CN, utilizando electrodos de Au y Au recubierto con poli-(3,4- etilendioxitiofeno) (PEDOT) y PEDOT-Óxido de Grafeno Reducido. Los estudios se llevaron a cabo por voltamperometría cíclica, electrólisis en condiciones galvanostáticas y potenciostáticas y técnicas cuantitativas como Cromatografía de Gases. Los resultados en el medio acuoso y medio orgánico demuestran mayores eficiencias farádicas y mayor cantidad de CO e H2 (gas de síntesis) producido cuando se utiliza el electrodo de Au recubierto con los materiales mencionados que cuando se utiliza el Au desnudo. En la mezcla de solventes se observó un gran efecto de la concentración de H2O en la respuesta voltamperométrica en presencia de CO2, obteniéndose señales catódicas con corrientes de hasta un orden de magnitud mayor a aquellas obtenidas en el medio orgánico cuando la fracción molar de H2O fue de 0,25.
Abstract. In this work, the results of the study of the electrochemical reduction of CO2 in aqueous media, CH3CN and mixtures of CH3CN:H2O using electrodes of Au and Au covered by Poly-(3,4-ethylenedioxytiophene) (PEDOT) and PEDOT-Reduced Graphene Oxide(RGO) are presented. This study was carried out using different electrochemical techniques like cyclic voltammetry, potentiostatic and galvanostatic electrolysis and analytical techniques like Gas Chromatography. The results in aqueous media and CH3CN showed higher faradic efficiencies and amount of CO and H2 (synthesis gas) produced when the electrodes of Au are covered by PEDOT or PEDOT-RGO than when the bare Au electrode was used. When the reduction was carried out in the mixture of CH3CN:H2O a high influence of the concentration of H2O was observed, and a cathodic signal in presence of CO2 with currents as high as -500 µA was obtained when the molar fraction of H2O in the mixture was 0,25.
Abstract. In this work, the results of the study of the electrochemical reduction of CO2 in aqueous media, CH3CN and mixtures of CH3CN:H2O using electrodes of Au and Au covered by Poly-(3,4-ethylenedioxytiophene) (PEDOT) and PEDOT-Reduced Graphene Oxide(RGO) are presented. This study was carried out using different electrochemical techniques like cyclic voltammetry, potentiostatic and galvanostatic electrolysis and analytical techniques like Gas Chromatography. The results in aqueous media and CH3CN showed higher faradic efficiencies and amount of CO and H2 (synthesis gas) produced when the electrodes of Au are covered by PEDOT or PEDOT-RGO than when the bare Au electrode was used. When the reduction was carried out in the mixture of CH3CN:H2O a high influence of the concentration of H2O was observed, and a cathodic signal in presence of CO2 with currents as high as -500 µA was obtained when the molar fraction of H2O in the mixture was 0,25.