Abstract
Porous Al particles were prepared by anisotropic anodic etching of small Al particles. The anisotropic anodic etching was carried out in a Cl− containing electrolyte using a close-packed Al particle structure in which particles were electrically connected through the contact points between them. Anisotropic tunnel pits in the 〈100〉 direction of the Al crystal lattice were formed in the particles. After the etching, the porous Al particles could be dispersed from the close-packed structure easily. The average depth of the etching pits was ca. 25μm. The obtained porous Al particles will be useful for various functional devices which require large surface area, such as substrates for catalysts and electrodes for electrolytic capacitors.
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