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dc.contributor.authorSeo, Han Gil
dc.contributor.authorStaerz, Anna
dc.contributor.authorKim, Dennis S
dc.contributor.authorLeBeau, James M
dc.contributor.authorTuller, Harry L
dc.date.accessioned2023-02-14T17:12:42Z
dc.date.available2023-02-14T17:12:42Z
dc.date.issued2022-12-03
dc.identifier.urihttps://hdl.handle.net/1721.1/148048
dc.description.abstractMetal oxides are an important class of functional materials, and for many applications, ranging from solid oxide fuel/electrolysis cells, oxygen permeation membranes, and oxygen storage materials to gas sensors (semiconducting and electrolytic) and catalysts, the interaction between the surface and oxygen in the gas phase is central. Ubiquitous Si-impurities are known to impede this interaction, commonly attributed to the formation of glassy blocking layers on the surface. Here, the surface oxygen exchange coefficient (kchem ) is examined for Pr0.1 Ce0.9 O2-δ (PCO), a model mixed ionic electronic conductor, via electrical conductivity relaxation measurements, and the area-specific resistance (ASR) by electrochemical impedance spectroscopy. It is demonstrated that even low silica levels, introduced by infiltration, depress kchem by a factor 4000, while the ASR increases 40-fold and we attribute this to its acidity relative to that of PCO. The ability to fully regenerate the poisoned surface by the subsequent addition of basic Ca- or Li-species is further shown. This ability to not only recover Si-poisoned surfaces by tuning the relative surface acidity of an oxide surface, but subsequently outperform the pre-poisoned response, promises to extend the operating life of materials and devices for which the catalytic oxygen/solid interface reaction is central.en_US
dc.language.isoen
dc.publisherWileyen_US
dc.relation.isversionof10.1002/adma.202208182en_US
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivs Licenseen_US
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en_US
dc.sourceWileyen_US
dc.titleTuning Surface Acidity of Mixed Conducting Electrodes: Recovery of Si‐Induced Degradation of Oxygen Exchange Rate and Area Specific Resistanceen_US
dc.typeArticleen_US
dc.identifier.citationSeo, Han Gil, Staerz, Anna, Kim, Dennis S, LeBeau, James M and Tuller, Harry L. 2022. "Tuning Surface Acidity of Mixed Conducting Electrodes: Recovery of Si‐Induced Degradation of Oxygen Exchange Rate and Area Specific Resistance." Advanced Materials.
dc.contributor.departmentMassachusetts Institute of Technology. Department of Materials Science and Engineeringen_US
dc.relation.journalAdvanced Materialsen_US
dc.eprint.versionFinal published versionen_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dc.date.updated2023-02-14T16:54:43Z
dspace.orderedauthorsSeo, HG; Staerz, A; Kim, DS; LeBeau, JM; Tuller, HLen_US
dspace.date.submission2023-02-14T16:54:46Z
mit.licensePUBLISHER_CC
mit.metadata.statusAuthority Work and Publication Information Neededen_US


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