Energy conversion is to transform energy from one of its forms into another. Due to the limitations in use of
fossil fuels, new energy materials with high efficiency are required for human. In order to develop advanced
energy materials, we arefocusing on researches for energy transformation from sunlight or an electric source
to hydrogen energy or chemical energy.
Solar energy conversion: Sunlight is an unlimited natural source but its efficiency for transformation to other
energies is low. We are developing high efficient solar energy materials using earth abundant materials-based
catalysts such as titanium dioxide (TiO2).
Electrochemcial energy conversion: Electric source can transfer chemical energy to electrical energy by the
coupling electrochemical reactions of energy materials. We are investigating low cost (in energy consumption)
and long durable electrochemical energy materials such as transition metal chalcogenide materials.
Two-dimensional materials science is to synthesize and develop two-dimensionally crystalline materials
consisting of single or few layer sheets of atoms (e.g., graphene or transition metal dichalcogenide) as
electronic or energy materials. It’s electronic or optoelectronic property such as electron mobility is extraordinary
in the two-dimensional plane, so that two-dimensional materials are promising candidates for next generation
electronic and optoelectronic applications. We are developing synthesis methods to tune the chemical structure,
the thickness, and the composition of two-dimensional materials.
Energy storage is to develop the electrochemical energy storage materials or systems such as rechargeable
batteries and supercapacitors. In order to decrease environmental impacts, green and renewable energies are
globally required. We are investigating environmentally friendly energy materials (such as silicon and carbon-
based materials) for long durable battery systems and highly powered supercapacitors.