Electrochemical tools to disclose the electrochemical reduction mechanism of CO2 in aprotic solvents and ionic liquids
Mena Fernández, Silvia (Universitat Autònoma de Barcelona. Departament de Química)
Ribas Saurí, Esteve (Universitat Autònoma de Barcelona. Departament de Química)
Richart, Clara (Universitat Autònoma de Barcelona. Departament de Química)
Gallardo, Iluminada (Universitat Autònoma de Barcelona. Departament de Química)
Faraudo, Jordi (Institut de Ciència de Materials de Barcelona)
Shaw, Scott K. (University of Iowa. Department of Chemistry)
Guirado López, Gonzalo (Universitat Autònoma de Barcelona. Departament de Química)

Date:	2021
Abstract:	Carbon dioxide (CO2) plays a key role in controlling the temperature of the Earth. But the increase in the concentration of CO2 in the atmosphere brings with it a series of consequences, originating several environmental problems. The use of electrochemical, spectroscopic and molecular dynamics techniques are useful toolkits to valorize carbon dioxide, and to know the reduction mechanism as a function of CO2 concentration, the cathode nature, and the electrolyte. This manuscript will be mainly centered in the use of ionic liquids (IL) for efficient CO2 capture and valorization into different valuable products thanks to the CO2 electrochemical reduction. In this sense, spectroelectrochemistry based on cyclic voltammetry coupled with Polarization Modulation-Infrared Reflection-Absorption Spectroscopy (PM-IRRAS) and Infrared Reflection-Absorption Spectroscopy (IRRAS) appear to be an efficient instrument to follow the CO2 reactivity in imidazolium ionic liquids. Finally, we present molecular dynamics paired with cyclic voltammetry in order to calculate the diffusion coefficient of CO2 and the number of electrons involved in its reduction process, respectively. Therefore, the current research opens the door to the use of theoretical-experimental approaches altogether to determine how is the CO2 reduction mechanism. The CO2 reduction products in function of the solvent and nature of the cathode is suggested, proving that the product obtained from the electrochemical reduction of CO2 depends on the electrode material and the solvent.
Grants:	Ministerio de Economía y Competitividad CTQ2015-65439-R Agencia Estatal de Investigación PID2019-106171RB-I00 Agencia Estatal de Investigación CTQ2017-90659-REDT Ministerio de Economía y Competitividad CEX2019-000917-S
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Carbon dioxide ; Ionic Liquids ; Electrochemistry ; Reduction Mechanism
Published in:	Journal of Electroanalytical Chemistry, Vol. 895 (August 2021) , art. 115411, ISSN 1572-6657

DOI: 10.1016/j.jelechem.2021.115411

Postprint 30 p, 2.5 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Group in Electrochemistry, Photochemistry and Organic Reactivity (GEFRO)
Articles > Research articles
Articles > Published articles