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My research interest is in solar-to-energy conversion systems, especially particulate photocatalysts.
In this system, one semiconductor particle absorbs solar light to convert it to chemical energy such as hydrogen. We can say the combination of solar cell + electrocatalysis is included in a particle with a few μm size.
My strategy is controlling the semiconductor properties from the viewpoint of the electronic structures and orbital interactions.
Lone Pair Chemistry
Lone Pair Chemistry
Post-transition metal cations with a lone pair (ns2np0) electronic configuration such as Pb2+ and Bi3+ are important components of materials for solar-to-energy conversion.
As in molecules like NH3, the lone pair is often stereochemically "active" in crystals.
Controlling its activity or lone pair/lone pair interaction based on the key orbital interaction provides new insights for developing functional materials. (JACS in 2024, Chem. Mater. in 2023, ACS Energy Lett. in 2023)
Oxy-iodede
Oxy-iodede
Although iodine is a key element for realising various functionalities, such as high ionic conductivity and efficient photoelectric conversion, they have rarely been used for photocatalytic water splitting because of its instability. Starting from the first oxy-iodide photocatalysts, I have developed oxy-iodide water-splitting photocatalysts more efficient than the chloride and bromide counterparts (JACS in 2021, Chem. Mater. in 2023).
Carrier Dynamics
Carrier Dynamics
Carrier dynamics in the bulk of a photocatalyst particle remain elusive. I have tackled this to control it and achieve better electron-hole separation (Chem. Sci. in 2023, EES Catalysis in 2023)
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