Nanoporous iron oxide membranes: Layer-by-layer deposition and electrochemical characterisation of processes within nanopores

Katy J. McKenzie, Frank Marken, Michael Hyde, Richard G. Compton

Research output: Contribution to journalArticlepeer-review

53 Citations (Scopus)

Abstract

A versatile procedure for the formation of nanoporous metal oxide membranes is reported, based on a layer-by-layer deposition procedure ('directed assembly') of metal oxide nanoparticles with appropriate 'linker' molecules; here Fe2O3 particles and phytic acid. Two types of nanoporous Fe2O3 membranes have been prepared and characterised: (A) a nanofilm deposit composed of 4-5 nm diameter Fe2O3 particles linked by phytic acid and (B) a nanoporous film formed after calcination of the type A deposit at 500°C in air. The nanofilm deposits are characterised by microscopy (SEM and AFM) and by electrochemical methods. Mechanically stable and homogeneous nanofilm deposits with controlled thickness (ca. 3 nm per layer deposited) were obtained. Transport of small molecules or ions through the nanoporous structure and their electrochemical conversion are shown to be fast in the presence of a sufficiently high concentration of supporting electrolyte. During the electrochemical oxidation of ferrocyanide, Fe(CN)6-4, the nanoporous structure of the type A deposit is shown to act as an 'active' membrane, which changes the electrode kinetics by 'double-layer superposition' effects. For the second type of nanofilm, type B, ferrocyanide is accumulated by adsorption within the porous structure.

Original languageEnglish
Pages (from-to)625-629
Number of pages5
JournalNew Journal of Chemistry
Volume26
Issue number5
DOIs
Publication statusPublished - 1 Jan 2002

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Materials Chemistry

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