Thermodynamic explanation of the universal correlation between oxygen evolution activity and corrosion of oxide catalysts
Abstract
In recent years, the oxygen evolution reaction (OER) has attracted increased research interest due to its crucial role in electrochemical energy conversion devices for renewable energy applications. The vast majority of OER catalyst materials investigated are metal oxides of various compositions. The experimental results obtained on such materials strongly suggest the existence of a fundamental and universal correlation between the oxygen evolution activity and the corrosion of metal oxides. This corrosion manifests itself in structural changes and/or dissolution of the material. We prove from basic thermodynamic considerations that any metal oxide must become unstable under oxygen evolution conditions irrespective of the pH value. The reason is the thermodynamic instability of the oxygen anion in the metal oxide lattice. Our findings explain many of the experimentally observed corrosion phenomena on different metal oxide OER catalysts. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000103076Publication status
publishedExternal links
Journal / series
Scientific ReportsVolume
Pages / Article No.
Publisher
NatureSubject
Thermodynamics; Electrocatalysis; CorrosionOrganisational unit
03910 - Schmidt, Thomas J. / Schmidt, Thomas J.
More
Show all metadata
ETH Bibliography
yes
Altmetrics