Al(2)O(3)-TiO(2) composite oxide films on etched aluminum foil fabricated by electrodeposition and anodization

摘要

Ti species have been deposited on low-voltage etched aluminum foils by a simple electrochemical method using a Ti anode as Ti source in a Ti-free I(2)-dissolved acetone solution. After annealing at 500-600 degrees C in air, an Al(2)O(3)-TiO(2) composite oxide film was formed on the surface of the etched aluminum foil by anodizing galvanostatically in an ammonium adipate solution. The effects of I(2) concentration in the acetone solution, applied anode voltage, electrolysis time, and annealing temperature on the specific capacitance of the aluminum anode foils were investigated. The TiO(2)-deposited specimens prepared by applying a potential of 50 V for 3 min in 2.5 mM I(2)-added acetone solution followed by annealing at 550 degrees C after anodization exhibited the highest specific capacitance, with an enhancement of 22% compared with pure etched aluminum foil specimens. The electro-deposition process and the change of the anode voltage during the anodization were analyzed.