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Citation: Ye Jian-Hui. Impedance Analysis of Fe(II/III) Ions/Nafion Film Coated Electrode System[J]. Acta Physico-Chimica Sinica, ;1992, 8(03): 364-369. doi: 10.3866/PKU.WHXB19920315 shu

Impedance Analysis of Fe(II/III) Ions/Nafion Film Coated Electrode System

Ye Jian-Hui

1.
Department of Chemistry, Xiamen University, Xiamen 361005

Received Date: 27 February 1991
Available Online: 15 June 1992

The charge transport of Fe(Ⅱ/Ⅲ) ions within the Nafion film and in solutions has theoretically been derived. The diffusion coefficients and standard rate constants of Fe(Ⅱ/Ⅲ) ions in the film were evaluated to be 2.9×10~(-7) cm~2·s~(-1) and 1.1×10~(-3) cm·s~(-1), respectively, by analyzing the system impedance based on the small amplitude potential step. Obtained value of k°′ is less than an order of magnitude to uncoated electrodes, which is correlated with large diffusion rate of Fe(Ⅱ/Ⅲ) ions within the Nafion film. Effects of electrode potentials and concentrations of supporting electrolytes on the system impedances have been discussed. Results are reasonably agreed with theoretical derivations.
- Nafion film; Iron ions; Charge transport; Diffusion; Impedance measurement
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