Activation of surface oxygen sites on an iridium-based model catalyst for the oxygen evolution reaction View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2017-01

AUTHORS

Alexis Grimaud, Arnaud Demortière, Matthieu Saubanère, Walid Dachraoui, Martial Duchamp, Marie-Liesse Doublet, Jean-Marie Tarascon

ABSTRACT

The oxygen evolution reaction (OER) is of prime importance in multiple energy storage devices; however, deeper mechanistic understanding is required to design enhanced electrocatalysts for the reaction. Current understanding of the OER mechanism based on oxygen adsorption on a metallic surface site fails to fully explain the activity of iridium and ruthenium oxide surfaces, and the drastic surface reconstruction observed for the most active OER catalysts. Here we demonstrate, using La2LiIrO6 as a model catalyst, that the exceptionally high activity found for Ir-based catalysts arises from the formation of active surface oxygen atoms that act as electrophilic centres for water to react. Moreover, with the help of transmission electron microscopy, we observe drastic surface reconstruction and iridium migration from the bulk to the surface. Therefore, we establish a correlation between surface activity and surface stability for OER catalysts that is rooted in the formation of surface reactive oxygen. More... »

PAGES

nenergy2016189

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/nenergy.2016.189

DOI

http://dx.doi.org/10.1038/nenergy.2016.189

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1041401652


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279 Réseau sur le Stockage Electrochimique de l’Energie (RS2E), FR CNRS 3459, 80039 Amiens Cedex, France
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282 schema:name Chimie du Solide et de l’Energie, UMR 8260, Collège de France, 75231 Paris Cedex 05, France
283 Réseau sur le Stockage Electrochimique de l’Energie (RS2E), FR CNRS 3459, 80039 Amiens Cedex, France
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286 schema:name Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons (ER-C) and Peter Grünberg Institute (PGI), Forschungszentrum Jülich, 52428 Jülich, Germany
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