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Correlation between Oxygen Vacancies and Oxygen Evolution Reaction Activity for a Model Electrode: PrBaCo 2 O 5+ δ
Author(s) -
Marelli Elena,
Gazquez Jaume,
Poghosyan Emiliya,
Müller Elisabeth,
Gawryluk Dariusz J.,
Pomjakushina Ekaterina,
Sheptyakov Denis,
Piamonteze Cinthia,
Aegerter Dino,
Schmidt Thomas J.,
Medarde Marisa,
Fabbri Emiliana
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202103151
Subject(s) - oxygen evolution , x ray absorption spectroscopy , oxygen , stoichiometry , electron energy loss spectroscopy , chemistry , absorption spectroscopy , perovskite (structure) , spectroscopy , transmission electron microscopy , chemical physics , crystallography , materials science , analytical chemistry (journal) , electrode , nanotechnology , electrochemistry , physics , organic chemistry , quantum mechanics , chromatography
The role of the perovskite lattice oxygen in the oxygen evolution reaction (OER) is systematically studied in the PrBaCo 2 O 5+δ family. The reduced number of physical/chemical variables combined with in‐depth characterizations such as neutron dif‐fraction, O K‐edge X‐ray absorption spectroscopy (XAS), electron energy loss spectroscopy (EELS), magnetization and scanning transmission electron microscopy (STEM) studies, helps investigating the complex correlation between OER activity and a single perovskite property, such as the oxygen content. Larger amount of oxygen vacancies appears to facilitate the OER, possibly contributing to the mechanism involving the oxidation of lattice oxygen, i.e., the lattice oxygen evolution reaction (LOER). Furthermore, not only the number of vacancies but also their local arrangement in the perovskite lattice influences the OER activity, with a clear drop for the more stable, ordered stoichiometry.