Journal
JOURNAL OF SOLUTION CHEMISTRY
Volume 40, Issue 9, Pages 1645-1656Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10953-011-9735-x
Keywords
Charge-transfer resistance; Cyclic voltammetry; Electrochemical impedance spectroscopy; Heterogeneous electron transfer rate; Multi-walled carbon nanotubes
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The oxidation of ferrocene (FeCp2) to ferrocenium cation were determined. On both electrodes tested, the electron transfer process was found to be quasi-reversible and diffusion controlled in all investigated solvent mixtures. The E (1/2) values were shifted toward less positive potentials with the enrichment of mixtures in MeOH, due probably to the larger Lewis basicity of the MeOH molecules. Furthermore, values of both D and k (s) diminish with the increase of MeOH content following the progressive increase of viscosity of the solvent medium. Among the electrodes probed, GC provides faster electrochemical process since it affords less charge-transfer resistance (R (ct)), and consequently, an insignificant barrier for interfacial electron transfer.
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