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dc.contributor.author
Braun, Artur
dc.contributor.author
Chen, Qianli
dc.date.accessioned
2017-11-13T12:09:17Z
dc.date.available
2017-10-06T02:49:52Z
dc.date.available
2017-11-13T12:09:17Z
dc.date.issued
2017
dc.identifier.other
10.1038/ncomms15830
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/191102
dc.identifier.doi
10.3929/ethz-b-000191102
dc.description.abstract
Hydration of oxygen-deficient metal oxides causes filling of oxygen vacancies and formation of hydroxyl groups with interstitial structural protons, rotating around the oxygen in localized motion. Thermal activation from 500 to 800 K triggers delocalization of the protons by jumping to adjacent oxygen ions, constituting proton conductivity. We report quantitative analyses of proton and lattice dynamics by neutron-scattering data, which reveal the interaction of protons with the crystal lattice and proton–phonon coupling. The motion for the proton trapped in the elastic crystal field yields Eigen frequencies and coupling constants, which satisfy Holstein’s polaron model for electrons and thus constitutes first experimental evidence for a proton polaron at high temperature. Proton jump rates follow a polaron model for cerium-oxygen and hydroxyl stretching modes, which are thus vehicles for proton conductivity. This confirms that the polaron mechanism is not restricted to electrons, but a universal charge carrier transport process.
en_US
dc.language.iso
en
en_US
dc.publisher
Nature Publishing Group
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.title
Experimental neutron scattering evidence for proton polaron in hydrated metal oxide proton conductors
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2017-06-14
ethz.journal.title
Nature Communications
ethz.journal.volume
8
en_US
ethz.pages.start
15830
en_US
ethz.size
8 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
London
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2017-10-06T02:50:03Z
ethz.source
WOS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-11-13T12:09:23Z
ethz.rosetta.lastUpdated
2019-02-02T13:20:18Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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