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

被引:51
作者
McKenzie, KJ
Marken, F [1 ]
Hyde, M
Compton, RG
机构
[1] Univ Loughborough, Dept Chem, Loughborough LE11 3TU, Leics, England
[2] Univ Oxford, Phys & Theoret Chem Lab, Oxford OX1 3QZ, England
关键词
D O I
10.1039/b200912a
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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 nano film 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 nano film deposits are characterised by microscopy (SEM and AFM) and by electrochemical methods. Mechanically stable and homogeneous nano film 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 nano film, type B, ferrocyanide is accumulated by adsorption within the porous structure.
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收藏
页码:625 / 629
页数:5
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