The merged tunnels intensely reduced the specific surface area of etched aluminum foil using inaluminum electrolyte capacitor, which restrict the increase of the specific capacitance. In this paper, thenano-scale Sn nuclei was fabricated on aluminum surface by electroless plating to improve the surfacearea. The uniformly distributed Sn nuclei on aluminum surface could serve as the pitting initiation sites,due to the composition of Al-Sn localized micro-batteries. The distribution of the etched tunnels for thealuminum foil with proper Sn nuclei are improved significantly in contrast with that for the conventionalaluminum foil, resulting in the enhancement of the specific surface area..
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