A film-like photocatalyst that produces hydrogen gas as long as the sun shines in the sink
Decomposition of water using a mixed powder photocatalyst film On March 10, 2016, NEDO announced that it has developed a film that combines two types of powdered photocatalysts. When hydrogen is produced using water, the solar energy conversion efficiency reaches 1.1%, and hydrogen can be supplied on a cheap and large scale. The product was developed by NEDO and Artificial Photosynthesis Technology Research Group (ARPChem), Tokyo University and Toto. NEDO and ARP Chem are promoting the development of "technology for the manufacture of carbon dioxide feedstock base chemicals (artificial light synthesis project)". The photocatalyst film developed this time is also one of the research results of this project. The photocatalyst film is produced by a particle transfer process. First, a hydrogen gas photocatalyst powder and an oxygen-generating photocatalyst powder are mixed, coated on a glass substrate, and a conductive layer is vapor-deposited thereon to strip the conductive layer and the photocatalyst layer. The photocatalyst film has a simple structure, does not use auxiliary power, and can decompose water only by shining sunlight into the water. In addition, since hydrogen and oxygen are generated on the same surface, high performance can be maintained while a large area is expanded. In addition, it is envisaged to mass-produce when it is put into practical use, and a coating type based on screen printing has also been successfully developed, and it has been found that hydrogen and oxygen can be stably produced. By adopting screen printing, it is expected that the manufacturing cost will be drastically reduced, and it is possible to realize a water-decomposing photocatalyst module capable of producing hydrogen gas at a very low cost. In the future, hydrogen-manufactured devices and module structures will be optimized for practical use, and before the end of 2021, solar energy conversion efficiency will reach 10%. This result was made public on the March 7 (British time) online newsletter in the British science journal Nature Materials. (Reporter: Kudo Daisuke)
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Method for preparing mixed powder photocatalyst film by particle transfer printing method 
Method for producing a mixed powder type photocatalyst film by screen printing (left) and a mixed powder type photocatalyst film with 10 cm square (right)