Immobilization of a [CoIIICoII(H2O)W11O39]7-Polyoxoanion for the Photocatalytic Oxygen Evolution Reaction

Sreejith P. Nandan, Nadiia I. Gumerova (Korresp. Autor*in), Jasmin S. Schubert, Hikaru Saito, Annette Rompel, Alexey Cherevan (Korresp. Autor*in), Dominik Eder

Veröffentlichungen: Beitrag in FachzeitschriftArtikelPeer Reviewed

Abstract

The ongoing transition to renewable energy sources and the implementation of artificial photosynthetic setups call for an efficient and stable water oxidation catalyst (WOC). Here, we heterogenize a molecular all-inorganic [CoIIICoII(H2O)W11O39]7-({CoIIICoIIW11}) Keggin-type polyoxometalate (POM) onto a model TiO2surface, employing a 3-aminopropyltriethoxysilane (APTES) linker to form a novel heterogeneous photosystem for light-driven water oxidation. The {CoIIICoIIW11}-APTES-TiO2hybrid is characterized using a set of spectroscopic and microscopic techniques to reveal the POM integrity and dispersion to elucidate the POM/APTES and APTES/TiO2binding modes as well as to visualize the attachment of individual clusters. We conduct photocatalytic studies under heterogeneous and homogeneous conditions and show that {CoIIICoIIW11}-APTES-TiO2performs as an active light-driven WOC, wherein {CoIIICoIIW11} acts as a stable co-catalyst for water oxidation. In contrast to the homogeneous WOC performance of this POM, the heterogenized photosystem yields a constant WOC rate for at least 10 h without any apparent deactivation, demonstrating that TiO2not only stabilizes the POM but also acts as a photosensitizer. Complementary studies using photoluminescence (PL) emission spectroscopy elucidate the charge transfer mechanism and enhanced WOC activity. The {CoIIICoIIW11}-APTES-TiO2photocatalyst serves as a prime example of a hybrid homogeneous-heterogeneous photosystem that combines the advantages of solid-state absorbers and well-defined molecular co-catalysts, which will be of interest to both scientific communities and applications in photoelectrocatalysis and CO2reduction.

OriginalspracheEnglisch
Seiten (von - bis)505-515
Seitenumfang11
FachzeitschriftACS Materials Au
Jahrgang2
Ausgabenummer4
DOIs
PublikationsstatusVeröffentlicht - 13 Juli 2022

ÖFOS 2012

  • 104011 Materialchemie
  • 103018 Materialphysik
  • 104017 Physikalische Chemie

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