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dc.contributor.authorAlbo Sánchez, Jonathan 
dc.contributor.authorBeobide Pacheco, Garikoitz
dc.contributor.authorCastaño Sánchez, Pedro
dc.contributor.authorIrabien Gulías, José Ángel 
dc.contributor.otherUniversidad de Cantabriaes_ES
dc.description.abstractIn this study, we examine the electrochemical-driven reduction of CO2 to methanol at Cu2O/ZnO gas diffusion electrodes in soluble pyridine-based electrolytes at different concentrations. The process is evaluated first by cyclic voltammetric analyses and then, for the continuous reduction of CO2 in a filter-press electrochemical cell. The results showed that the use of pyridine-based soluble co-catalysts lowered the overpotential for the electrochemical reduction of CO2, enhancing also reaction performance (i.e. reaction rate and Faradaic efficiency). Reaction outcome is discussed on the basis of the role that N-ligands play on the mechanism and the inductive effect caused by the electron-releasing or electron-withdrawing substituents of the aromatic ring. In particular, the maximum methanol formation rate and Faradaic efficiency reached at the 2-methylpyridine (with electron-releasing substituents)-based system with a pH of 7.6 and an applied current density of j = 1 mA cm−2 were r = 2.91 μmol m−2 s−1 and FE = 16.86%, respectively. These values significantly enhance those obtained in the absence of any molecular catalyst (r = 0.21 μmol m−2 s−1 and FE = 1.2%). The performance was further enhanced when lowering the electrolyte pH by adding HCl (r = 4.42 μmol m−2 s−1 and FE = 25.6% at pH = 5), although the system showed deactivation in the long run (5 h) which appears largely to be due to a change in product selectivity of the reaction (i.e. formation of ethylene).es_ES
dc.description.sponsorshipThe authors gratefully acknowledge the financial support from the Spanish Ministry of Economy and Competitiveness (MINECO), under the projects CTQ2013-48280-C3-1-R, CTQ2014-55716-REDT and Juan de la Cierva program (JCI-2012-12073).es_ES
dc.format.extent25 p.es_ES
dc.rights© 2017, Elsevier. Licensed under the Creative Commons Reconocimiento-NoComercial-SinObraDerivadaes_ES
dc.sourceJournal of CO2 Utilization, 2017, 18, 164-172es_ES
dc.subject.otherCO2 reductiones_ES
dc.subject.otherPyridine-based molecular catalystses_ES
dc.subject.otherCopper oxidees_ES
dc.titleMethanol electrosynthesis from CO2 at Cu2O/ZnO prompted by pyridine-based aqueous solutionses_ES

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© 2017, Elsevier. Licensed under the Creative Commons Reconocimiento-NoComercial-SinObraDerivadaExcept where otherwise noted, this item's license is described as © 2017, Elsevier. Licensed under the Creative Commons Reconocimiento-NoComercial-SinObraDerivada