Stability of metallo-porphyrin networks under oxygen reduction and evolution conditions in alkaline media

Transition metal atoms stabilised by organic ligands or as oxides exhibit promising catalytic activity for the electrocatalytic reduction and evolution of oxygen. Built-up from earth-abundant elements, they offer affordable alternatives to precious-metal based catalysts for application in fuel cells...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Hötger, Diana, Etzkorn, Markus, Morchutt, Claudius, Wurster, Benjamin, Dreiser, Jan, Stepanow, Sebastian, Grumelli, Doris Elda, Gutzler, Rico, Kern, Klaus
Formato: Articulo
Lenguaje:Inglés
Publicado: 2019
Materias:
Química
Catalysts
Macrocyclic molecules
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/132485
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-132485
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
Catalysts
Macrocyclic molecules
spellingShingle Química
Catalysts
Macrocyclic molecules
Hötger, Diana
Etzkorn, Markus
Morchutt, Claudius
Wurster, Benjamin
Dreiser, Jan
Stepanow, Sebastian
Grumelli, Doris Elda
Gutzler, Rico
Kern, Klaus
Stability of metallo-porphyrin networks under oxygen reduction and evolution conditions in alkaline media
topic_facet Química
Catalysts
Macrocyclic molecules
description Transition metal atoms stabilised by organic ligands or as oxides exhibit promising catalytic activity for the electrocatalytic reduction and evolution of oxygen. Built-up from earth-abundant elements, they offer affordable alternatives to precious-metal based catalysts for application in fuel cells and electrolysers. For the understanding of a catalyst's activity, insight into its structure on the atomic scale is of highest importance, yet commonly challenging to experimentally access. Here, the structural integrity of a bimetallic iron tetrapyridylporphyrin with co-adsorbed cobalt electrocatalyst on Au(111) is investigated using scanning tunneling microscopy and X-ray absorption spectroscopy. Topographic and spectroscopic characterization reveals structural changes of the molecular coordination network after oxygen reduction, and its decomposition and transformation into catalytically active Co/Fe (oxyhydr)oxide during oxygen evolution. The data establishes a structure–property relationship for the catalyst as a function of electrochemical potential and, in addition, highlights how the reaction direction of electrochemical interconversion between molecular oxygen and hydroxyl anions can have very different effects on the catalyst's structure.
format Articulo
Articulo
author Hötger, Diana
Etzkorn, Markus
Morchutt, Claudius
Wurster, Benjamin
Dreiser, Jan
Stepanow, Sebastian
Grumelli, Doris Elda
Gutzler, Rico
Kern, Klaus
author_facet Hötger, Diana
Etzkorn, Markus
Morchutt, Claudius
Wurster, Benjamin
Dreiser, Jan
Stepanow, Sebastian
Grumelli, Doris Elda
Gutzler, Rico
Kern, Klaus
author_sort Hötger, Diana
title Stability of metallo-porphyrin networks under oxygen reduction and evolution conditions in alkaline media
title_short Stability of metallo-porphyrin networks under oxygen reduction and evolution conditions in alkaline media
title_full Stability of metallo-porphyrin networks under oxygen reduction and evolution conditions in alkaline media
title_fullStr Stability of metallo-porphyrin networks under oxygen reduction and evolution conditions in alkaline media
title_full_unstemmed Stability of metallo-porphyrin networks under oxygen reduction and evolution conditions in alkaline media
title_sort stability of metallo-porphyrin networks under oxygen reduction and evolution conditions in alkaline media
publishDate 2019
url http://sedici.unlp.edu.ar/handle/10915/132485
work_keys_str_mv AT hotgerdiana stabilityofmetalloporphyrinnetworksunderoxygenreductionandevolutionconditionsinalkalinemedia
AT etzkornmarkus stabilityofmetalloporphyrinnetworksunderoxygenreductionandevolutionconditionsinalkalinemedia
AT morchuttclaudius stabilityofmetalloporphyrinnetworksunderoxygenreductionandevolutionconditionsinalkalinemedia
AT wursterbenjamin stabilityofmetalloporphyrinnetworksunderoxygenreductionandevolutionconditionsinalkalinemedia
AT dreiserjan stabilityofmetalloporphyrinnetworksunderoxygenreductionandevolutionconditionsinalkalinemedia
AT stepanowsebastian stabilityofmetalloporphyrinnetworksunderoxygenreductionandevolutionconditionsinalkalinemedia
AT grumellidoriselda stabilityofmetalloporphyrinnetworksunderoxygenreductionandevolutionconditionsinalkalinemedia
AT gutzlerrico stabilityofmetalloporphyrinnetworksunderoxygenreductionandevolutionconditionsinalkalinemedia
AT kernklaus stabilityofmetalloporphyrinnetworksunderoxygenreductionandevolutionconditionsinalkalinemedia
bdutipo_str Repositorios
_version_ 1764820453968314368

Ejemplares similares