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Covalent Grafting of Ruthenium Complexes on Iron Oxide Nanoparticles: Hybrid Materials for Photocatalytic Water Oxidation

Abstract : The present environmental crisis prompts the search for renewable energy sources such as solar-driven production of hydrogen from water. Herein, we report an efficient hybrid photocatalyst for water oxidation, consisting of a ruthenium polypyridyl complex covalently grafted on core/shell Fe@FeOx nanoparticles via a phosphonic acid group. The photoelectrochemical measurements were performed under 1 sun illumination in 1 M KOH. The photocurrent density of this hybrid photoanode reached 20 μA/cm2 (applied potential of +1.0 V vs reversible hydrogen electrode), corresponding to a turnover frequency of 0.02 s–1. This performance represents a 9-fold enhancement of that achieved with a mixture of Fe@FeOx nanoparticles and a linker-free ruthenium polypyridyl photosensitizer. This increase in performance could be attributed to a more efficient electron transfer between the ruthenium photosensitizer and the Fe@FeOx catalyst as a consequence of the covalent link between these two species through the phosphonate pendant group.
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https://hal.archives-ouvertes.fr/hal-03436779
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Submitted on : Friday, November 19, 2021 - 2:57:39 PM
Last modification on : Wednesday, April 20, 2022 - 11:46:03 AM
Long-term archiving on: : Sunday, February 20, 2022 - 7:12:26 PM

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Quyen Nguyen Thi, Elodie Rousset, van T. H. Nguyen, Vincent Collière, Pierre Lecante, et al.. Covalent Grafting of Ruthenium Complexes on Iron Oxide Nanoparticles: Hybrid Materials for Photocatalytic Water Oxidation. ACS Applied Materials & Interfaces, Washington, D.C. : American Chemical Society, 2021, 13 (45), pp.53829-53840. ⟨10.1021/acsami.1c15051⟩. ⟨hal-03436779⟩

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