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

Journal Article · · ChemSusChem
Abstract

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.

Sponsoring Organization:
USDOE
Grant/Contract Number:
FG02-07ER15909
OSTI ID:
1402095
Alternate ID(s):
OSTI ID: 1537539
Journal Information:
ChemSusChem, Journal Name: ChemSusChem Journal Issue: 22 Vol. 10; ISSN 1864-5631
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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