Abstract
Zr-Al2O3 composite oxide films are promising dielectric materials for future use in aluminum (Al) electrolytic capacitors. The films were prepared on etched Al foil samples by ZrO2 sol-gel coating and anodizing. To inhibit O2 evolution during anodization, 2-methyl-1, 3-propanediol (MPD) was used with boric acid solution as an electrolyte. In this study, we investigated the effects of the ratio of MPD in boric acid solution on the anodizing behaviors and electrical properties of ZrO2-coated Al foil. The thickness of the Al2O3 layer decreased as the MPD ratio increased. The MPD-boric acid solution effectively inhibited O2 evolution. The samples anodized in MPD-boric acid electrolyte with a ratio of 3:10 (volume %) exhibited the highest specific capacitance. Relative to those of samples anodized in boric acid solution, the specific capacitances of samples analyzed in the MPD-boric acid electrolyte increased by 45.5% at 700V, 40.0% at 800V, and 66.7% at 900V.
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