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Zhao J.,University of Tokyo | Zhao J.,Japan Technological Research Association | Zhao J.,CAS Dalian Institute of Chemical Physics | Minegishi T.,University of Tokyo | And 13 more authors.
Angewandte Chemie - International Edition | Year: 2014

Porous films of p-type CuInS2, prepared by sulfurization of electrodeposited metals, are surface-modified with thin layers of CdS and TiO2. This specific porous electrode evolved H2 from photoelectrochemical water reduction under simulated sunlight. Modification with thin n-type CdS and TiO2 layers significantly increased the cathodic photocurrent and onset potential through the formation of a p-n junction on the surface. The modified photocathodes showed a relatively high efficiency and stable H2 production under the present reaction conditions. © 2014 Wiley-VCH Verlag GmbH & Co. KGaA , Weinheim.

Pan C.,Japan National Institute of Materials Science | Takata T.,Japan National Institute of Materials Science | Nakabayashi M.,University of Tokyo | Nakabayashi M.,Japan Technological Research Association | And 6 more authors.
Angewandte Chemie - International Edition | Year: 2015

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. © 2015 Wiley-VCH Verlag GmbH & Co. KGaA.

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