TY - JOUR
T1 - Facile cation electro-insertion into layer-by-layer assembled iron phytate films
AU - Cummings, Charles Y
AU - Roweth, Alistair H
AU - Ching, Andrew K Z
AU - Jenkins, A Toby A
AU - Mitchels, John M
AU - Shariki, Sara
AU - Liew, Soon Yee
AU - Thielemans, Wim
AU - Walsh, Darren A
AU - Marken, Frank
PY - 2010/12
Y1 - 2010/12
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=78649703758&partnerID=8YFLogxK
UR - http://dx.doi.org/10.1016/j.elecom.2010.10.006
U2 - 10.1016/j.elecom.2010.10.006
DO - 10.1016/j.elecom.2010.10.006
M3 - Article
SN - 1388-2481
VL - 12
SP - 1722
EP - 1726
JO - Electrochemistry Communications
JF - Electrochemistry Communications
IS - 12
ER -