Visible-Light-Driven Water Oxidation with a Polyoxometalate-Complexed Hematite Core of 275 Iron Atoms

Biswarup Chakraborty, Gal Gan-Or, Yan Duan, Manoj Raula, Ira A. Weinstock

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

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 α-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 275 iron 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.

Original languageEnglish
Pages (from-to)6584-6589
Number of pages6
JournalAngewandte Chemie - International Edition
Volume58
Issue number20
DOIs
StatePublished - 13 May 2019

Keywords

  • hematite
  • iron oxide
  • polyoxometalates
  • visible light
  • water oxidation

ASJC Scopus subject areas

  • Catalysis
  • Chemistry (all)

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