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Achieving solar overall water splitting with hybrid photosystems of photosystem II and artificial photocatalysts

Solar overall ​water splitting is a promising sustainable approach for solar-to-chemical energy conversion, which harnesses solar irradiation to oxidize ​water to ​oxygen and reduce the protons to ​hydrogen. The ​water oxidation step is vital but difficult to achieve through inorganic photocatalysis. However, nature offers an efficient light-driven water-oxidizing enzyme, photosystem II (PSII). Here we report an overall water splitting natural–artificial hybrid system, in which the plant PSII and inorganic photocatalysts (for example, ​Ru/​SrTiO3:Rh), coupled with an inorganic electron shuttle [​Fe(CN)63−/​Fe(CN)64−], are integrated and dispersed in aqueous solutions. The activity of this hybrid photosystem reaches to around 2,489 mol ​H2 (mol PSII)−1 h−1 under visible light irradiation, and solar overall ​water splitting is also achieved under solar irradiation outdoors. The optical imaging shows that the hybrid photosystems are constructed through the self-assembly of PSII adhered onto the inorganic photocatalyst surface. Our work may provide a prototype of natural–artificial hybrids for developing autonomous solar water splitting system.

 

http://www.nature.com/ncomms/2014/140813/ncomms5647/full/ncomms5647.html

Nature Communications 5, Article number: 4647 doi:10.1038/ncomms5647

发布日期:2014/09/01 发布者: 点击数: