The developments of water-splitting systems that can efficiently use visible light have been a major challenge for many
years in order to realize efficient conversion of solar light. We have developed a new type of photocatalysis system that
can split water into H2 and O2 under visible light irradiation, which was inspired by the two-step photoexcitation (Zscheme)
mechanism of natural photosynthesis in green plants. In this system, the water splitting reaction is broken up
into two stages: one for H2 evolution and the other for O2 evolution; these are combined by using a shuttle redox couple
(Red/Ox) in the solution. The introduction of a Z-scheme mechanism reduces the energy required to drive each
photocatalysis process, extending the usable wavelengths significantly (~460 nm for H2 evolution and ~600 nm for O2evolution) from that in conventional water splitting systems (~460 nm) based on one-step photoexcitation in single
semiconductor material.
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