Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.187
Publication date: 18th December 2023
The establishment of so-called artificial photosynthetic reactions that use solar energy to drive the synthesis of organic matter using H2O and CO2 as raw materials is significant for reducing CO2 emissions and realizing carriers of abundant solar energy. 1, 2 3 Our primary approach to artificial photosynthetic reactions is the combinatorial technologies that effectively utilize the excellent properties of solid semiconductor photosensitizers and molecular metal complex catalysts. One important progress is the electrochemical and photocatalytic CO2 reduction reaction (CO2RR) over metal complex catalysts at a low reaction overpotential approaching the theoretical lower limit in aqueous solution. The essential point of the low overpotential CO2RR is the operation of the metal complex catalysts with coexisting carbon support and metal cations such as K+. 3, 4 In addition, we have realized the low overpotential CO2RR combined the H2O oxidation reaction (WOR), which is a pair reaction for artificial photosynthesis, in a single aqueous solution at near neutral pH. 5 Simultaneous operation of the CO2RR and the WOR in a single solution is one of the concepts necessary to construct a new simplified form of an artificial photosynthetic system that does not require a setup for separation of sites for CO2RR and WOR like the thylakoid membrane existing in natural photosynthesis.
In this presentation, I will explain systems that make effective use of semiconductors and metal-complex catalysts driven in a single aqueous solution under simulated sunlight or visible light irradiation: a photocatalytic system functioning by a two-step photoexcitation (Z-scheme) mechanism in a self-organized manner using a combination of particulate (CuGa)0.3Zn1.4S2, BiVO4, and Co-bipyridine complex 6, 7, a so-called artificial leaf with a thickness of less than 1 mm consisting of Ru-bipyridine complex, IrOx, and an amorphous Si-Ge triple junction 5, and a 1m2-sized cell composed of Ru-bipyridine complex, IrOx, and a crystalline Si solar cell. 8-10
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