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The development of renewable and alternative energy is a challenge of our present times. Many studies on the development of alternative energies are in progress. However, development of a method to generate alternative energy, that minimizes the environmental pollution by byproducts when generating and converting the energy (see figure), is important from an economical and industrial point of view. Thus, development of water oxidation catalytic system that generates almost no environmentally harmful byproducts can lead to a large impact on academic and economic levels.

In our laboratory, our research is focused on developing water oxidation catalyst systems using transition metal complexes. To design water oxidation catalysts, two major research objectives were set.
The first is to identify the mechanism of the oxygen-oxygen bond formation, and the second is to design photocatalytic water oxidation catalysts. To this end, research is done on synthesis and reactivity of new metal-oxo species, as well as on oxygen-oxygen bond formation using metal-oxo species. To develop practical water oxidation catalysts, research is also done on generation of metal-oxo species using water source, water oxidation catalyst reactivities study, effects of oxygen production using water oxidation catalysts, and design and development of photocatalytic water oxidation catalysts.
In addition to the research on molecular oxygen release through these water oxidation catalysts, studies on the generation of hydrogen peroxide and hydrogen gas are also conducted.