Facile cation electro-insertion into layer-by-layer assembled iron phytate films

Reference:

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.

Related documents:

Official URL:

http://dx.doi.org/10.1016/j.elecom.2010.10.006

Abstract

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.

Export

Actions (login required)