Monatshefte für Chemie - Chemical Monthly

, Volume 140, Issue 6, pp 595–600 | Cite as

Oxygen evolution: the mechanism of formation of porous anodic alumina

Orignal Paper

Abstract

Aluminium anodization behavior in ammonium sebacate solution (w = 4%) in ethylene glycol, and in several H3PO4-containing electrolytes, has been investigated. A new mechanism is proposed for the formation of porous anodic films. The model emphasizes the close relationship between pore generation and oxygen evolution. PO4 3− ions incorporated in the anodic films behave as the primary source of avalanche electrons. It is the avalanche electronic current through the barrier film that causes oxygen evolution during anodization. When growth of anodic oxide and oxygen evolution occur simultaneously at the aluminium anode, cavities or pores are formed in the resulting films. Accordingly, the mechanisms of growth of barrier and porous films are not very different in nature. These findings are a decisive new step towards full understanding of the nature of anodic alumina films.

Graphical abstract

Keywords

Porous anodic alumina Nanostructures Microporous materials Formation mechanism Oxygen evolution 

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  1. 1.School of Chemical EngineeringNanjing University of Science and TechnologyNanjingChina

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