ELECTROCHEMICAL PROPERTIES OF TiO₂ NANOTUBE ARRAYS FILM PREPARED BY ANODIC OXIDATION

TiO₂ nanotube arrays were fabricated by anodic oxidation method at different applied voltages and electrochemical properties of the TiO₂ nanotube arrays were investigated. At higher applied voltage, the average pore size and the length of the tubes were increased due to an increase in the rate of TiO₂ formation and dissolution during the anodic oxidation. TiO₂ nanotube electrode fabricated at applied voltage of 30V delivered the 1st discharge capacity of about 235μAh/cm². Although the electrode showed a large irreversible capacity during the initial charge/discharge process, it exhibited excellent cycle performance until the 40th cycle because the larger pore size allowed homogeneous contact between the tubes and liquid electrolyte by easy penetration of liquid electrolyte into the tubes.