Catalyst Coated Membrane Electrodes for the gas phase CO2 electroreduction to formate
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Título: | Catalyst Coated Membrane Electrodes for the gas phase CO2 electroreduction to formate |
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Autor/es: | Díaz-Sainz, Guillermo | Alvarez-Guerra, Manuel | Solla-Gullón, José | García Cruz, Leticia | Montiel, Vicente | Irabien, Ángel |
Grupo/s de investigación o GITE: | Electroquímica Aplicada y Electrocatálisis |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica |
Palabras clave: | CO2 electroreduction | Formate | Sn nanoparticles | Catalyst Coated Embrane Electrode | Gas phase |
Área/s de conocimiento: | Química Física |
Fecha de publicación: | 4-dic-2018 |
Editor: | Elsevier |
Cita bibliográfica: | Catalysis Today. 2020, 346: 58-64. doi:10.1016/j.cattod.2018.11.073 |
Resumen: | The electrochemical valorisation of captured CO2 is an attractive option to obtain value-added products, and at the same time, to chemically store energy from intermittent renewable sources. Among the different products, formic acid/formate is particularly interesting since it is one of the most promising materials for hydrogen storage and candidate fuel for low-temperature fuel cells. In this work, a process for CO2 electroreduction to formate is studied on a continuous filter-press cell using an innovative electrode: Sn Catalyst Coated Membrane Electrodes (Sn-CCMEs) - comparing with previous approaches based on Sn Gas Diffusion Electrodes (Sn-GDEs), using the same synthesised tin nanoparticles (Sn NPs) and operating conditions. The Sn-CCME is prepared by depositing Sn NPs directly over a Nafion 117 membrane, and it allows working with a gaseous CO2 flow humidified with water as the input of the electrochemical cell, avoiding the use of the liquid catholyte. Sn-CCME operates at lower current densities (45 mA cm-2) than previous Sn-GDEs (200 mA cm-2), which resulted in lower rates of formate production. However, the proposed Sn-CCME, allowed achieving even higher formate concentrations with an energy consumption 50% lower than with the Sn-GDEs. The influence of key variables such as temperature and water input flow on the performance of the process using Sn-CCMEs was also analysed in a controlled experimental set-up specifically designed and built for this goal. Increasing the temperature of the gaseous stream did not improve the performance. The best results were obtained at ambient conditions of temperature (20 °C) and with the amount of water in the CO2 stream at 0.5 g h-1, giving the highest formate concentration (19.2 g L-1) with a Faradaic efficiency close to 50% and an energy consumption of 244 kW h kmol-1. More research is still required to further improve CCME configuration in order to increase formate rate and efficiency without increasing energy consumption. |
Patrocinador/es: | This work was conducted under the framework of the Spanish Ministry of Economy, Industry and Competitiveness (MINECO), projects CTQ2016-76231-C2-1-R (AEI/FEDER, UE) and CTQ2016-76231-C2-2-R (AEI/FEDER, UE). JSG acknowledges financial support from VITC (Vicerrectorado de Investigación y Transferencia de Conocimiento) of the University of Alicante (UTALENTO16-02). |
URI: | http://hdl.handle.net/10045/84449 |
ISSN: | 0920-5861 (Print) | 1873-4308 (Online) |
DOI: | 10.1016/j.cattod.2018.11.073 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2018 Elsevier B.V. |
Revisión científica: | si |
Versión del editor: | https://doi.org/10.1016/j.cattod.2018.11.073 |
Aparece en las colecciones: | INV - LEQA - Artículos de Revistas |
Archivos en este ítem:
Archivo | Descripción | Tamaño | Formato | |
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2018_Diaz-Sainz_etal_CatTod_accepted.pdf | Accepted Manuscript (acceso abierto) | 826,8 kB | Adobe PDF | Abrir Vista previa |
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