Optimization of Photoanodes for Photocatalytic Water Oxidation by Combining a Heterogenized Iridium Water-Oxidation Catalyst with a High-Potential Porphyrin Photosensitizer.

Autor: Materna KL; Department of Chemistry, Yale University, New Haven, CT, 06520, USA.; Yale Energy Sciences Institute, Yale University, West Haven, CT, 06516, USA., Jiang J; Department of Chemistry, Yale University, New Haven, CT, 06520, USA.; Yale Energy Sciences Institute, Yale University, West Haven, CT, 06516, USA., Regan KP; Department of Chemistry, Yale University, New Haven, CT, 06520, USA.; Yale Energy Sciences Institute, Yale University, West Haven, CT, 06516, USA., Schmuttenmaer CA; Department of Chemistry, Yale University, New Haven, CT, 06520, USA.; Yale Energy Sciences Institute, Yale University, West Haven, CT, 06516, USA., Crabtree RH; Department of Chemistry, Yale University, New Haven, CT, 06520, USA.; Yale Energy Sciences Institute, Yale University, West Haven, CT, 06516, USA., Brudvig GW; Department of Chemistry, Yale University, New Haven, CT, 06520, USA.; Yale Energy Sciences Institute, Yale University, West Haven, CT, 06516, USA.
Jazyk: angličtina
Zdroj: ChemSusChem [ChemSusChem] 2017 Nov 23; Vol. 10 (22), pp. 4526-4534. Date of Electronic Publication: 2017 Oct 23.
DOI: 10.1002/cssc.201701693
Abstrakt: The development of water-splitting dye-sensitized photoelectrochemical cells has gained interest owing to their ability to generate renewable fuels from solar energy. In this study, photoanodes were assembled from a SnO 2 film sensitized with a combination of a high-potential CF 3 -substituted porphyrin dye with a tetrahydropyranyl-protected hydroxamic acid surface-anchoring group and a Cp*Ir (Cp*=pentamethylcyclopentadienyl) water-oxidation catalyst containing a silatrane anchoring group. The dye/catalyst ratios were varied from 2:1 to 32:1 to optimize the photocatalytic water oxidation. Photoelectrochemical measurements showed not only more stable and reproducible photocurrents for lower dye/catalyst ratios but also improved photostability. O 2 production was confirmed in real time over a 20 h period with a Clark electrode. Photoanodes prepared from 2:1 and 8:1 dye/catalyst sensitization solutions provided the most active electrodes for photocatalytic water oxidation and performed approximately 30-35 turnovers in 20 h.
(© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Databáze: MEDLINE
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