A Complex Perovskite-Type Oxynitride: The First Photocatalyst for Water Splitting Operable at up to 600 nm

One of the simplest methods for splitting water into H2 and O2 with solar energy entails the use of a particulate‐type semiconductor photocatalyst. To harness solar energy efficiently, a new water‐splitting photocatalyst that is active over a wider range of the visible spectrum has been developed. I...

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Veröffentlicht in:Angewandte Chemie International Edition 2015-03, Vol.54 (10), p.2955-2959
Hauptverfasser: Pan, Chengsi, Takata, Tsuyoshi, Nakabayashi, Mamiko, Matsumoto, Takao, Shibata, Naoya, Ikuhara, Yuichi, Domen, Kazunari
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Sprache:eng
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Zusammenfassung:One of the simplest methods for splitting water into H2 and O2 with solar energy entails the use of a particulate‐type semiconductor photocatalyst. To harness solar energy efficiently, a new water‐splitting photocatalyst that is active over a wider range of the visible spectrum has been developed. In particular, a complex perovskite‐type oxynitride, LaMgxTa1−xO1+3xN2−3x (x≥1/3), can be employed for overall water splitting at wavelengths of up to 600 nm. Two effective strategies for overall water splitting were developed. The first entails the compositional fine‐tuning of a photocatalyst to adjust the bandgap energy and position by forming a series of LaMgxTa1−xO1+3xN2−3x solid solutions. The second method is based on the surface coating of the photocatalyst with a layer of amorphous oxyhydroxide to control the surface redox reactions. By combining these two strategies, the degradation of the photocatalyst and the reverse reaction could be prevented, resulting in successful overall water splitting. Overall water splitting was achieved on a new complex perovskite‐type oxynitride photocatalyst, LaMgxTa1−xO1+3xN2−3x (x≥1/3), with an absorption edge at 600 nm. Coating the surface of the RhCrOy/LaMgxTa1−xO1+3xN2−3x photocatalyst particles with a layer of amorphous oxyhydroxide effectively prevented the reverse reaction and self‐oxidation of the photocatalyst.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201410961