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Published in Applied Catalysis B: Environmental

“Artificial photosynthesis using a suspension system of photocatalyst particles in water” by Tomiko M Suzuki et al., in collaboration with the Tokyo University of Science, was published in Applied Catalysis B: Environmental.

During artificial photosynthesis, where carbon compounds are synthesized from sunlight, water, and carbon dioxide (CO2), suspending photocatalyst particles in water is expected to reduce the cost of the system. In this study, we developed an artificial photosynthesis system that operates based on a two-step photoexcitation (Z-scheme) mechanism similar to that of plants using a simple mixture of semiconductor photocatalyst particles and water-soluble metal complex in an aqueous solution. In this system, newly developed metal complex molecules act as both an electron mediator between two photocatalysts and CO2-reduction catalyst. Thus, visible light driven CO2 reduction and water oxidation reactions spontaneously occur in water. Furthermore, owing to the considerable amount of suppressed hydrogen generation in water, the CO2 to CO conversion could achieve high CO2 selectivity (98%) and reaction rate (over 10 times the conventional rate) in an aqueous suspension system, which is higher than the reported values. These results will contribute to the development of a carbon-neutral society.

Title: Photocatalytic CO2 Reduction by a Z-scheme Mechanism in an Aqueous Suspension of Particulate (CuGa)0.3Zn1.4S2, BiVO4 and a Co Complex Operating Dual-functionally as an Electron Mediator and as a Cocatalyst
Authors: Suzuki, TM., Yoshino, S., Sekizawa, K., Yamaguchi, Y., Kudo, A., Morikawa, T.
Journal Name: Applied Catalysis B: Environmental
Published: June 8, 2022
https://doi.org/10.1016/j.apcatb.2022.121600

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