Thick self-organized porous zirconium oxide formed in H2SO4/NH4F electrolytes

Abstract We report the formation of self-organized porous layer of ZrO 2 by anodization of zirconium in H 2 SO 4 electrolytes containing low concentrations of NH 4 F. Under optimized electrolyte conditions and polarization in range of several 10 V, ordered sponge-like porous ZrO 2 is obtained. The pores typically have a diameter ranged from 10 to 100 nm. Most remarkably the porous ZO 2 layers can reach thickness in the order of several 10 μm. The pore size is almost independent of the applied potential, whereas the amount of well-structured area on the sample surface increases with a higher applied potential.

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