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Reduction of titania (TiO 2 -P25) with hydrogen leads to the formation of oxygen vacancies and Ti 3+ ions, most likely located on the titania surface, and electrons that occupy donor sites in the bulk of titania. The number of these defects is controlled by equilibrium and is therefore quenched by the presence of water. The electrons located at the donor sites are responsible for the high conductance of hydrogen treated titania. From analysis of the activation energies for conduction it isdoi:10.1039/b210004e fatcat:dufsyecr6bftzj2xe25n7eztpe