Ceramic Electrodes Based on Magneli Phases of Titanium Oxides

摘要

Monophase and polyphase ceramic materials based on Magneli phases of titanium oxides of composition Ti_3O_5, Ti_4O_7, Ti_5O_9, and Ti_6O_(11) were synthesized. The materials were obtained by mechanical activation of rutile with titanium and additives of niobium, vanadium, and iron, with subsequent sintering both in reductive atmosphere (hydrogen) and in neutral atmosphere (argon) in the temperature interval of 1060-1080 deg C. The dependences of the potentials of the obtained ceramic samples on time and composition during anodic polarization at current density of 5A/dm~2 in a 1M solution of sulfuric acid were investigated. We developed a technique for manufacturing anodes in the form of hollow cylinders 60 mm in diameter with a wall 5 mm thick, and flat discs more than 60 mm in diameter.