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Validation of binuc...
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Busch, Michael,1983Luleå tekniska universitet,Gothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology,Materialvetenskap,Department of Chemistry, Electrochemistry, University of Gothenburg, S-412 96 Gothenburg, Sweden
(författare)
Validation of binuclear descriptor for mixed transition metal oxide supported electrocatalytic water oxidation
- Artikel/kapitelEngelska2013
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LIBRIS-ID:oai:research.chalmers.se:40179159-1921-4478-b027-28d9244a4feb
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https://research.chalmers.se/publication/159609URI
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https://doi.org/10.1016/j.cattod.2012.04.060DOI
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https://gup.ub.gu.se/publication/159609URI
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https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-103951URI
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Språk:engelska
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Sammanfattning på:engelska
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The energy profiles of the di-hydroxo – di-oxo – peroxo pathway are discussed for a set of 3d transition metal oxides comprising V(III–V), Cr(III–V), Mn(II–IV, Mn(III–V), Fe(II–IV), Co(II–IV) and Ni(II–IV) using density functional theory (DFT). Two classes of oxides were identified. The first class, comprising V(III–V), Cr(III–V) and Fe(II–IV), displays exothermicity for the oxidation of di-hydroxo to di-oxo versus the tyrosine/tyrosyl-radical (TyrOH/TyrO) couple and endothermicity for the subsequent O-O bond formation ([−/+] class), while the second class, comprising Mn(III–V), Co(II–IV) and Ni(II–IV), shows endothermicity with respect to the oxidation step and exothermicity for the O-O bond formation ([+/−] class). The energetics of the endothermicity (exothermicity) for the oxidation step is reflected in the exothermicity (endothermicity) of the subsequent O-O bond formation step. Mn(II–IV) is not part of any of the two classes. Instead it shows zero exothermicity with respect to TyrOH/TyrO for the oxidation step and a small endothermicity for the O-O bond formation step. Despite the promising energy profile Mn(II–IV) is argued to be inactive due to a large activation barrier. A set of improved hetero-nuclear candidate catalysts is predicted by mixing [−/+] with [+/−] transition metal oxides. A simple and efficient method to estimate the energy profile of mixed transition metal oxides from the homo-nuclear systems is demonstrated. The validity of this procedure is checked and agreement with the explicitly calculated values is found. All considered heteronuclear candidate catalysts display enhanced performance compared to the pure homonuclear systems.
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Ahlberg, Elisabet,1952Gothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology,Department of Chemistry, Electrochemistry, University of Gothenburg, S-412 96 Gothenburg, Sweden(Swepub:gu)xahlbe
(författare)
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Panas, Itai,1959Chalmers tekniska högskola,Chalmers University of Technology,Department of Chemistry and Biotechnology, Energy and Materials, Chalmers University of Technology, S-412 96 Gothenburg, Sweden(Swepub:cth)itai
(författare)
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Göteborgs universitetInstitutionen för kemi och molekylärbiologi
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Catalysis Today: Elsevier BV202:1, s. 114-1190920-58611873-4308
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