Abstract
Abstract Fe2+ and Fe3+ were incorporated into Pt–Nafion. The full incorporation of Fe2+ into H+-type Nafion was attained beyond 0.3 M FeSO4. The ion-exchange selectivity of Fe2+ was estimated to about 2 to H+. The incorporated ions exhibited diffusional behavior inside the composite electrode. The formal potential of the incorporated iron(III/II) redox couple was dependent on both the H2SO4 and the Fe3+ and Fe2+ concentrations. The potential shift was, however, not so large as that reported on some redox systems on polymer-coated electrodes. The incorporated redox couple was revealed to behave as a mediator in the oxidation of l-ascorbic acid.
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