caa a22 4500 445327693 CHVBK 20180317142726.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s10953-011-9735-x doi (NATIONALLICENCE)springer-10.1007/s10953-011-9735-x Electrochemistry on Multi-walled Carbon Nanotubes in Organic Solutions [Elektronische Daten] [Nikos Tsierkezos, Eike Rathsmann, Uwe Ritter] The oxidation of ferrocene (FeCp2) to ferrocenium cation ( $\mbox{FeCp}_{2}^{+}$ ) (where Cp: cyclopentadienyl anion, $\mbox{C}_{5}\mbox{H}_{5}^{-}$ ) was investigated by means of cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) on either a glassy carbon (GC) electrode or a film consisted of multi-walled carbon nanotubes (MWCNT) in acetone (ACE), methanol (MeOH) and ACE/MeOH binary mixtures. The half-wave potentials (E 1/2), the diffusion coefficients (D) and the heterogeneous electron transfer rate constants (k s) of the redox couple $\mbox{FeCp}_{2}^{+/0}$ 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. Springer Science+Business Media, LLC, 2011 Charge-transfer resistance nationallicence Cyclic voltammetry nationallicence Electrochemical impedance spectroscopy nationallicence Heterogeneous electron transfer rate nationallicence Multi-walled carbon nanotubes nationallicence Tsierkezos Nikos Institut für Physik, Fachgebiet Chemie, Fakultät für Mathematik und Naturwissenschaften, Technische Universität Ilmenau, Weimarer Str. 25, 98693, Ilmenau, Thüringen, Germany aut Rathsmann Eike Institut für Physik, Fachgebiet Chemie, Fakultät für Mathematik und Naturwissenschaften, Technische Universität Ilmenau, Weimarer Str. 25, 98693, Ilmenau, Thüringen, Germany aut Ritter Uwe Institut für Physik, Fachgebiet Chemie, Fakultät für Mathematik und Naturwissenschaften, Technische Universität Ilmenau, Weimarer Str. 25, 98693, Ilmenau, Thüringen, Germany aut Journal of Solution Chemistry Springer US; http://www.springer-ny.com 40/9(2011-09-01), 1645-1656 0095-9782 40:9<1645 2011 40 10953 https://doi.org/10.1007/s10953-011-9735-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10953-011-9735-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Tsierkezos Nikos Institut für Physik, Fachgebiet Chemie, Fakultät für Mathematik und Naturwissenschaften, Technische Universität Ilmenau, Weimarer Str. 25, 98693, Ilmenau, Thüringen, Germany aut NATIONALLICENCE 700 1- Rathsmann Eike Institut für Physik, Fachgebiet Chemie, Fakultät für Mathematik und Naturwissenschaften, Technische Universität Ilmenau, Weimarer Str. 25, 98693, Ilmenau, Thüringen, Germany aut NATIONALLICENCE 700 1- Ritter Uwe Institut für Physik, Fachgebiet Chemie, Fakultät für Mathematik und Naturwissenschaften, Technische Universität Ilmenau, Weimarer Str. 25, 98693, Ilmenau, Thüringen, Germany aut NATIONALLICENCE 773 0- Journal of Solution Chemistry Springer US; http://www.springer-ny.com 40/9(2011-09-01), 1645-1656 0095-9782 40:9<1645 2011 40 10953 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer