1977 Volume 50 Issue 12 Pages 3153-3157
Solid-state anodic oxidation of aluminum contacted to a pellet of various organic conductors based on 7,7,8,8-tetracyanoquinodimethane was observed. A typical passivation curve was observed in the current-voltage characteristics for the anodic polarization of the metal. Along with impedance measurements on the electrode system, it was proved that the passivation is due partly to a thermal transformation in the organic conductor and partly to a solid-state anodization of aluminum, the latter being conditioned by the former through the formation of an electrolyte layer in situ. The current efficiency of anodization was estimated by a linear voltage sweep method to be as high as 2%, depending on the ambient moisture. The high efficiency explains the prominent self-healing action of a new type of solid electrolytic capacitor in which manganese dioxide is replaced by an organic-conductor counterelectrode.
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