Lattice oxygen exchange in rutile IrO2during the oxygen evolution reaction
File(s)
Author(s)
Schweinar, Kevin
Gault, Baptiste
Mouton, Isabelle
Kasian, Olga
Type
Journal Article
Abstract
The development of efficient acidic water electrolyzers relies on understanding dynamic changes of the Ir-based catalytic surfaces during the oxygen evolution reaction (OER). Such changes include degradation, oxidation, and amorphization processes, each of which somehow affects the material’s catalytic performance and durability. Some mechanisms involve the release of oxygen atoms from the oxide’s lattice, the extent of which is determined by the structure of the catalyst. While the stability of hydrous Ir oxides suffers from the active participation of lattice oxygen atoms in the OER, rutile IrO2 is more stable and the lattice oxygen involvement is still under debate due to the insufficient sensitivity of commonly used online electrochemical mass spectrometry. Here, we revisit the case of rutile IrO2 at the atomic scale by a combination of isotope labeling and atom probe tomography and reveal the exchange of oxygen atoms between the oxide lattice and water. Our approach enables direct visualization of the electrochemically active volume of the catalysts and allows for the estimation of an oxygen exchange rate during the OER that is discussed in view of surface restructuring and subsequent degradation. Our work presents an unprecedented opportunity to quantitatively assess the exchange of surface species during an electrochemical reaction, relevant for the optimization of the long-term stability of catalytic systems.
Date Issued
2020-07-02
Date Acceptance
2020-06-04
Citation
Journal of Physical Chemistry Letters, 2020, 11 (13), pp.5008-5014
ISSN
1948-7185
Publisher
American Chemical Society
Start Page
5008
End Page
5014
Journal / Book Title
Journal of Physical Chemistry Letters
Volume
11
Issue
13
Copyright Statement
Copyright © 2020 American Chemical Society. This work is published under a CC BY licence.
License URL
Identifier
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000547468400013&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=a2bf6146997ec60c407a63945d4e92bb
Subjects
Chemistry
Chemistry, Physical
DISSOLUTION
ELECTROLYSIS
ELECTRONIC-STRUCTURE
IRIDIUM
Materials Science
Materials Science, Multidisciplinary
Nanoscience & Nanotechnology
OXIDE CATALYSTS
Physical Sciences
Physics
Physics, Atomic, Molecular & Chemical
RUO2
RUTHENIUM
Science & Technology
Science & Technology - Other Topics
STABILITY
SURFACE
Technology
WATER OXIDATION
Publication Status
Published
Date Publish Online
2020-06-04