Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 20, Pages 6584-6589Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201900492
Keywords
hematite; iron oxide; polyoxometalates; visible light; water oxidation
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Funding
- Israel Science Foundation (ISF) [170/17]
- PBC-Israel
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Although metal oxide nanocrystals are often highly active, rapid aggregation (particularly in water) generally precludes detailed solution-state investigations of their catalytic reactions. This is equally true for visible-light-driven water oxidation with hematite -Fe2O3 nanocrystals, which bridge a conceptual divide between molecular complexes of iron and solid-state hematite photoanodes. We herein report that the aqueous solubility and remarkable stability of polyoxometalate (POM)-complexed hematite cores with 275iron atoms enable investigations of visible-light-driven water oxidation at this frontier using the versatile toolbox of solution-state methods typically reserved for molecular catalysis. The use of these methods revealed a unique mechanism, understood as a general consequence of fundamental differences between reactions of solid-state metal oxides and freely diffusing fragments of the same material.
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