Photoanodes for water oxidation with visible light based on a pentacyclic quinoid organic dye enabling proton-coupled electron transfer

A pentacyclic quinoid dye, KuQ(O) 3 OH, combining (i) extended visible absorption up to 600 nm, (ii) excited state reduction potential >2 V vs. NHE, and (iii) a photoinduced proton-coupled electron transfer mechanism, has been used for the fabrication of dye-sensitized SnO 2 photoanodes integrati...

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Bibliographic Details
Published in:Chemical communications (Cambridge, England) England), 2020-02, Vol.56 (15), p.2248-2251
Main Authors: Volpato, Giulia Alice, Marasi, Martina, Gobbato, Thomas, Valentini, Francesca, Sabuzi, Federica, Gagliardi, Valeria, Bonetto, Alessandro, Marcomini, Antonio, Berardi, Serena, Conte, Valeria, Bonchio, Marcella, Caramori, Stefano, Galloni, Pierluca, Sartorel, Andrea
Format: Article
Language:English
Subjects:
Chemical evolution
Current efficiency
Dyes
Efficiency
Electron transfer
Oxidation
Photoanodes
Protons
Ruthenium
State reduction
Tin dioxide
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Summary:A pentacyclic quinoid dye, KuQ(O) 3 OH, combining (i) extended visible absorption up to 600 nm, (ii) excited state reduction potential >2 V vs. NHE, and (iii) a photoinduced proton-coupled electron transfer mechanism, has been used for the fabrication of dye-sensitized SnO 2 photoanodes integrating a ruthenium polyoxometalate water oxidation catalyst. The resulting photoelectrode SnO 2 |KuQ(O) 3 OH|Ru 4 POM displays a light harvesting efficiency up to 90% in the range 500-600 nm, an onset potential as low as 0.2 V vs. NHE at pH 5.8, photoinduced oxygen evolution with a faradaic efficiency of 70 ± 15% and an absorbed-photon-to-current efficiency up to 0.12 ± 0.01%. A novel pentacyclic quinoid photosensitizer with extended absorption in the visible region and enabling proton-coupled electron transfer is employed in photoelectrodes for water oxidation in combination with a ruthenium polyoxometalate catalyst.
ISSN:1359-7345
1364-548X
DOI:10.1039/c9cc09805d