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Effect of the Cu(2+/1+) Redox Potential of Non-Macrocyclic Cu Complexes on Electrochemical CO(2) Reduction

Cu(2+/1+) complexes facilitate the reduction of CO(2) to valuable chemicals. The catalytic conversion likely involves the binding of CO(2) and/or reduction intermediates to Cu(2+/1+), which in turn could be influenced by the electron density on the Cu(2+/1+) ion. Herein we investigated whether modul...

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Autores principales: Kim, Kyuman, Wagner, Pawel, Wagner, Klaudia, Mozer, Attila J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10343594/
https://www.ncbi.nlm.nih.gov/pubmed/37446840
http://dx.doi.org/10.3390/molecules28135179
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author Kim, Kyuman
Wagner, Pawel
Wagner, Klaudia
Mozer, Attila J.
author_facet Kim, Kyuman
Wagner, Pawel
Wagner, Klaudia
Mozer, Attila J.
author_sort Kim, Kyuman
collection PubMed
description Cu(2+/1+) complexes facilitate the reduction of CO(2) to valuable chemicals. The catalytic conversion likely involves the binding of CO(2) and/or reduction intermediates to Cu(2+/1+), which in turn could be influenced by the electron density on the Cu(2+/1+) ion. Herein we investigated whether modulating the redox potential of Cu(2+/1+) complexes by changing their ligand structures influenced their CO(2) reduction performance significantly. We synthesised new heteroleptic Cu(2/1+) complexes, and for the first time, studied a (Cu-bis(8-quinolinolato) complex, covering a Cu(2+/1+) redox potential range of 1.3 V. We have found that the redox potential influenced the Faradaic efficiency of CO(2) reduction to CO. However, no correlation between the redox potential and the Faradaic efficiency for methane was found. The lack of correlation could be attributed to the presence of a Cu-complex-derived catalyst deposited on the electrodes leading to a heterogeneous catalytic mechanism, which is controlled by the structure of the in situ deposited catalyst and not the redox potential of the pre-cursor Cu(2+/1+) complexes.
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spelling pubmed-103435942023-07-14 Effect of the Cu(2+/1+) Redox Potential of Non-Macrocyclic Cu Complexes on Electrochemical CO(2) Reduction Kim, Kyuman Wagner, Pawel Wagner, Klaudia Mozer, Attila J. Molecules Article Cu(2+/1+) complexes facilitate the reduction of CO(2) to valuable chemicals. The catalytic conversion likely involves the binding of CO(2) and/or reduction intermediates to Cu(2+/1+), which in turn could be influenced by the electron density on the Cu(2+/1+) ion. Herein we investigated whether modulating the redox potential of Cu(2+/1+) complexes by changing their ligand structures influenced their CO(2) reduction performance significantly. We synthesised new heteroleptic Cu(2/1+) complexes, and for the first time, studied a (Cu-bis(8-quinolinolato) complex, covering a Cu(2+/1+) redox potential range of 1.3 V. We have found that the redox potential influenced the Faradaic efficiency of CO(2) reduction to CO. However, no correlation between the redox potential and the Faradaic efficiency for methane was found. The lack of correlation could be attributed to the presence of a Cu-complex-derived catalyst deposited on the electrodes leading to a heterogeneous catalytic mechanism, which is controlled by the structure of the in situ deposited catalyst and not the redox potential of the pre-cursor Cu(2+/1+) complexes. MDPI 2023-07-03 /pmc/articles/PMC10343594/ /pubmed/37446840 http://dx.doi.org/10.3390/molecules28135179 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Kim, Kyuman
Wagner, Pawel
Wagner, Klaudia
Mozer, Attila J.
Effect of the Cu(2+/1+) Redox Potential of Non-Macrocyclic Cu Complexes on Electrochemical CO(2) Reduction
title Effect of the Cu(2+/1+) Redox Potential of Non-Macrocyclic Cu Complexes on Electrochemical CO(2) Reduction
title_full Effect of the Cu(2+/1+) Redox Potential of Non-Macrocyclic Cu Complexes on Electrochemical CO(2) Reduction
title_fullStr Effect of the Cu(2+/1+) Redox Potential of Non-Macrocyclic Cu Complexes on Electrochemical CO(2) Reduction
title_full_unstemmed Effect of the Cu(2+/1+) Redox Potential of Non-Macrocyclic Cu Complexes on Electrochemical CO(2) Reduction
title_short Effect of the Cu(2+/1+) Redox Potential of Non-Macrocyclic Cu Complexes on Electrochemical CO(2) Reduction
title_sort effect of the cu(2+/1+) redox potential of non-macrocyclic cu complexes on electrochemical co(2) reduction
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10343594/
https://www.ncbi.nlm.nih.gov/pubmed/37446840
http://dx.doi.org/10.3390/molecules28135179
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