Abstract
High-voltage etched aluminum foils were coated with BaTiO3 (BT) films by vacuum infiltration using a sol. The specimens coated with the BT films were annealed at 450–550°C for 10–90min, and this procedure was repeated several times (n=0, 1, 2, 4, and 8cycles), after which the specimens were finally anodized at 100–500V. The BT films coated on the high-voltage etched aluminum foils were crystallized when annealed at 550°C for 30min. The thickness of the BT-coated layer decreased after the anodization, proving that the BT-coated layers were decomposed by the anodization, likely contributing to the formation of a BT–Al2O3 (BT–Al) composite oxide layer between the inner BT-coated layer and the outer Al2O3 layer. The maximum specific capacitance (CS) of the specimens was obtained after 4cycles of BT coating. The specific capacitances of the BT-coated specimens were higher than those of the specimens without the BT-film coating. The withstanding voltages of the specimens were approximately 123, 330, and 545V when the specimens were anodized at 100, 300, and 500V, respectively. These results suggest the successful fabrication of BT–Al composite oxide films on high-voltage etched aluminum foils.
Published Version
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