SURFACE-STRUCTURES ON TITANIUM-DIOXIDE ELECTRODES AFTER ELECTROCHEMICAL SILVER DEPOSITION

Selective silver deposition on the surface of titanium dioxide electro des provides the possibility to create various structures due to the a djustment of deposition conditions: type of TiO2 film, current density , external UV-irradiation or modification by the predeposition of silv er particles. We observed the formation of ultrafine Ag under small cu rrent and fractal deposits under the diffusion-limited mode. Features of the Ag state on the electrodes are studied by TEM, STM, and XPS. Th e selectivity effect of the deposition is explained by the formation o f a specific Ag-TiO2 structure with strong metal-support interaction.