Thermodynamics and relation to internal energy, Light and molecules: Photon field and Excited state, quantum yield, Kinetic Rate equations for photocatalysis: parallel, series, reactions, intensity, turnover rate. Photoprocesses at metals, oxides and semiconductors: concepts, discoveries and applications, Sensitization of photocatalysts and photosplitting of water. Advances in design, preparation and characterization of photocatalysts: oxides, chalcogenides, semiconductors, layered materials, porous materials, artificial photosynthesis. Photocatalysis and the environment: water purification, organic degradation by photocatalysts, self cleaning photocatalysts, airborne pollutant degradation, reactors for photocatalysis. Photoelectrochemistry : concepts, discoveries and applications, storage and synthetic cells, energy generation, cell design, diagnosis and characterization of photoprocesses at electrodes.