Atomic-layer-deposited TiO2–IrOX nanoscale thin-film electrocatalysts for water and chloride oxidation: Influence of local phase separation

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dc.check.date2024-06-06en
dc.check.infoAccess to this article is restricted until 12 months after publication by request of the publisher.en
dc.contributor.authorBabadi, Aeinen
dc.contributor.authorMonaghan, Scotten
dc.contributor.authorO'Rourke, Christopheren
dc.contributor.authorBraun, Michaelen
dc.contributor.authorBrock, Lindseyen
dc.contributor.authorCheng, Huikaien
dc.contributor.authorTessner, Teden
dc.contributor.authorHurley, Paul K.en
dc.contributor.authorMills, Andrewen
dc.contributor.authorMcIntyre, Paul C.en
dc.contributor.funderNational Science Foundationen
dc.date.accessioned2023-08-09T14:53:41Z
dc.date.available2023-08-09T14:53:41Z
dc.date.issued2023-06-06en
dc.description.abstractTiO2–IrOX alloys with a range of compositions synthesized by atomic layer deposition (ALD) were configured as anodes for water and chloride oxidation. The effects of the alloys’ average composition on oxygen evolution reaction (OER) and chloride evolution reaction (CER) activity were investigated and correlated with their nanoscale structures and electrical transport properties. A higher electronic conductivity and superior electrochemical performance were obtained for the TiO2–IrOX alloy films with 38% iridium in comparison with alloy films of either lower or higher IrOX content. This composition exhibits the lowest activation overpotentials and Tafel slopes for both the OER and CER of the alloy compositions investigated with values for the CER approaching those of IrOX (no TiO2 component present). The 38% Ir composition also exhibits the largest photovoltage, that is, 650 mV, during water oxidation experiments on TiO2–IrOX alloy/n-silicon Schottky photoanodes. The composition dependence of (photo)electrocatalyst properties is found to correlate with observed trends for phase separation of the alloys into locally TiO2- and IrO2-rich regions. Conductive atomic force microscopy and chemical mapping using energy dispersive X-ray spectroscopy in scanning transmission electron microscopy indicate greater phase separation for the 38% IrOX composition than for the others synthesized.en
dc.description.sponsorshipNational Science Foundation (Award no. CBET-1805084)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationBabadi, A., Monaghan, S., O'Rourke, C., Braun, M., Brock, L., Cheng, H., Tessner, T., Hurley, P. K., Mills, A. and McIntyre, P. C. (2023) 'Atomic-layer-deposited TiO2–IrOX nanoscale thin-film electrocatalysts for water and chloride oxidation: Influence of local phase separation', ACS Applied Energy Materials, 6(12), pp. 6419–6427. doi: 10.1021/acsaem.3c00216en
dc.identifier.doi10.1021/acsaem.3c00216en
dc.identifier.eissn2574-0962en
dc.identifier.endpage6427en
dc.identifier.issn2574-0962en
dc.identifier.issued12en
dc.identifier.journaltitleACS Applied Energy Materialsen
dc.identifier.startpage6419en
dc.identifier.urihttps://hdl.handle.net/10468/14804
dc.identifier.volume6en
dc.language.isoenen
dc.publisherACS Publicationsen
dc.rights© 2023, American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Energy Materials, 6(12), pp. 6419–6427, after technical editing by the publisher. To access the final edited and published work see: https://doi.org/10.1021/acsaem.3c00216en
dc.subjectOxygen evolution reactionen
dc.subjectCatalysten
dc.subjectAlloyen
dc.subjectMetastableen
dc.subjectAtomic layer depositionen
dc.titleAtomic-layer-deposited TiO2–IrOX nanoscale thin-film electrocatalysts for water and chloride oxidation: Influence of local phase separationen
dc.typeArticle (peer-reviewed)en
oaire.citation.issue12en
oaire.citation.volume6en
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