Artificial Photosynthetic Chemistry Process Technology Research Association (ARPChem) reports on a red transparent oxygen generating photoelectrode capable of highly efficient decomposition of water by sunlight using a tantalum nitride (Ta3N5) photocatalyst. Tantalum nitride photocatalysts are known as a material which absorbs visible light from 400 nm to 600 nm and photocatalytically decomposes water. In the overall program, energy generated from sunlight will be used to generate hydrogen from water and CO2 emitted from factories and other materials, to realize a process of manufacturing C4 olefins.

NEDO news release, January 25, 2019