A study of dimethylferrocene diffusion and electrode kinetics using microelectrode voltammetry in poly(ethylene glycol) solvent |
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Authors: | Huafang Zhou Ningyu Gu Shaojun Dong |
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Affiliation: | (1) Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Academy of Sciences, Changchun 130022, P.R. China, CN |
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Abstract: | The heterogeneous electron transfer rate constant (k s) of dimethylferrocene (DMFc) was estimated using cyclic voltammetric peak potential separations taken typically in a mixed diffusion geometry regime in a polyelectrolyte, and the diffusion coefficient (D) of DMFc was obtained using a steady-state voltammogram. The heterogeneous electron transfer rate constant and diffusion coefficient are both smaller by about 100-fold in the polymeric solvent than in the monomeric solvent. The results are in agreement with the difference of longitudinal dielectric relaxation time (τL) in the two kinds of solvents, poly(ethylene glycol) (PEG) and CH3CN, indicating that k s varies inversely with τL; k s is proportional to D of DMFc. Both D and k s of DMFc in PEG containing different supporting electrolytes and at different temperatures have been estimated. These results show that D and k s of DMFc increase with increasing temperature in the polyelectrolyte, whereas they vary only slightly with changing the supporting electrolyte. Received: 5 February 1998 / Accepted: 23 July 1998 |
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Keywords: | Heterogeneous electron transfer rate constant Diffusion coefficient Cyclic voltammetry Dimethylferrocene Polyelectrolyte |
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