Inorganic nanoparticles of different nature and size can be combined with the conducting polymers, giving nanocomposites of core shell structure with interesting physical properties and application potentials. Nanocomposites with core-shell structure based on metal oxide cores and conducting polymer shells are rather easy to prepare even in large quantities. In this book, the electrochemical and photoelectrochemical properties of such nanocomposites have been presented. For these investigations films of nanocomposites were prepared by an electrophoretic deposition process. The deposition process was studied in greater detail and kinetic details were determined. For these investigations for the first time the high voltage electrophoretic deposition process was combined with a quartz microbalance. A mechanism was proposed. Then the films were characterized by various electrochemical and photoelectrochemical methods.