Facile cation electro-insertion into layer-by-layer assembled iron phytate films
Cummings, C. Y., Roweth, A. H., Ching, A. K. Z., Jenkins, A. T. A., Mitchels, J. M., Shariki, S., Liew, S. Y., Thielemans, W., Walsh, D. A. and Marken, F., 2010. Facile cation electro-insertion into layer-by-layer assembled iron phytate films. Electrochemistry Communications, 12 (12), pp. 1722-1726.
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Molecular layer-by-layer assembly from pre-saturated aqueous solutions of Fe3+ and phytate is employed to build up iron phytate deposits on tin-doped indium oxide (ITO) electrodes. Globular films with approximately 1 nm growth per layer are observed by AFM imaging and sectioning. In electrochemical experiments the iron phytate films show well-defined voltammetric responses consistent with an immobilised Fe(III/II) redox system in aqueous (LiClO4, NaClO4, KClO4, phosphate buffer) and in ethanolic (LiClO4, NaClO4, NBu4ClO4) electrolyte solutions. The Fe(III/II) redox system is reversible and cation insertion/expulsion occurs fast on the timescale of voltammetric experiments even for more bulky NBu4 + cations and in ethanolic solution. Peak shape analysis and scan rate dependent midpoint potentials suggest structural changes accompanying the redox process and limiting propagation. Iron phytate is proposed as a versatile and essentially colourless cation electro-insertion material and as a potential energy storage material.
|Creators||Cummings, C. Y., Roweth, A. H., Ching, A. K. Z., Jenkins, A. T. A., Mitchels, J. M., Shariki, S., Liew, S. Y., Thielemans, W., Walsh, D. A. and Marken, F.|
|Departments||Faculty of Science > Chemistry|
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