1. Design of efficient photocatalysts through band gap engineering 2. Photochemical synthesis of nanoscale multicomponent metal species and their application to photocatalytic and electrochemical water splitting 3. Development of photocatalysts and system optimization for CO2 photoreduction 4. Heterogeneous photocatalysis for water purification 5. Air purification applications using photocatalysis 6. Substrate and support materials for photocatalysis 7. Two-dimensional materials for photocatalytic water splitting and CO2 reduction 8. Photocatalytic inactivation of microorganisms in water 9. Plasmon-induced photocatalytic transformations