Oxygen Reduction Reaction at Penta-Coordinated Co Phthalocyanines

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dc.contributor.authorViera, M.
dc.contributor.authorRiquelme, J.
dc.contributor.authorC, Aliaga
dc.contributor.authorJ.F., Marco
dc.contributor.authorW.C, Orellana
dc.contributor.authorJ.H., Zagal
dc.contributor.authorF, Tasca
dc.date.accessioned2021-11-23T20:09:47Z
dc.date.available2021-11-23T20:09:47Z
dc.date.issued2020-01
dc.description.abstractFrom the early 60s, Co complexes, especially Co phthalocyanines (CoPc) have been extensively studied as electrocatalysts for the oxygen reduction reaction (ORR). Generally, they promote the 2-electron reduction of O2 to give peroxide whereas the 4-electron reduction is preferred for fuel cell applications. Still, Co complexes are of interest because depending on the chemical environment of the Co metal centers either promote the 2-electron transfer process or the 4-electron transfer. In this study, we synthetized 3 different Co catalysts where Co is coordinated to 5 N atoms using CoN4 phthalocyanines with a pyridine axial linker anchored to carbon nanotubes. We tested complexes with electro-withdrawing or electro-donating residues on the N4 phthalocyanine ligand. The catalysts were characterized by EPR and XPS spectroscopy. Ab initio calculations, Koutecky–Levich extrapolation and Tafel plots confirm that the pyridine back ligand increases the Co-O2 binding energy, and therefore promotes the 4-electron reduction of O2. But the presence of electron withdrawing residues, in the plane of the tetra N atoms coordinating the Co, does not further increase the activity of the compounds because of pull-push electronic effects. © Copyright © 2020 Viera, Riquelme, Aliaga, Marco, Orellana, Zagal and Tasca.es
dc.description.sponsorshipIndexación: Scopuses
dc.identifier.citationFrontiers in ChemistryOpen AccessVolume 829 January 2020 Article number 22es
dc.identifier.issn22962646
dc.identifier.urihttp://repositorio.unab.cl/xmlui/handle/ria/21040
dc.language.isoenes
dc.publisherFrontiers Media S.A.es
dc.subjectCo phthalocyanine; electrocatalysis; oxygen reduction reaction; penta-coordinated Co phthalocyanines; volcano correlationses
dc.titleOxygen Reduction Reaction at Penta-Coordinated Co Phthalocyanineses
dc.typeArtículoes
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