Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 39, Pages 11428-11432Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201504427
Keywords
hematite; homogeneous catalysis; iridium; photoelectrochemistry; solar water splitting
Categories
Funding
- NSF [DMR 1055762]
- Argonne-Northwestern Solar Energy Research (ANSER) Energy Frontier Research Center - U.S. Department of Energy [DE-SC0001059]
- NSF Graduate Research Fellowship [DGE 1122492]
- Yale Entrepreneurial Institute
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1055762] Funding Source: National Science Foundation
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Solar water splitting in acidic solutions has important technological implications, but has not been demonstrated to date in a dual absorber photoelectrochemical cell. The lack of functionally stable water-oxidation catalysts (WOCs) in acids is a key reason for this slow development. The only WOCs that are stable at low pH are Ir-based systems, which are typically too expensive to be implemented broadly. It is now shown that this deficiency may be corrected by applying an ultra-thin monolayer of a molecular Ir WOC to hematite for solar water splitting in acidic solutions. The turn-on voltage is observed to shift cathodically by 250 mV upon the application of a monolayer of the molecular Ir WOC. When the molecular WOC is replaced by a heterogeneous multilayer derivative, stable solar water splitting for over 5 h is achieved with near-unity Faradaic efficiency.
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