The methyl viologen incorporated zeolite modified carbon paste electrode—part 1. Electrochemical behaviour in aqueous media. Effects of supporting electrolyte and immersion time

Abstract : Methyl viologen (MV++) is incorporated into a zeolite modified carbon paste electrode (ZMCPE). The electrochemical behaviour of MV++ is examined in aqueous media with various supporting electrolytes (NaCl, NaBr and several tetraalkylammonium bromides) by cyclic voltammetry, chronoamperometry and chronocoulometry. Quantitative in situ determination of MV++ leaching from paste into the external solution is performed using square wave voltammetry. The thickness of the ZMCPE involved in the electrochemical reaction of MV++ has been found to increase with experiment time. This was not the case with unmodified carbon paste. The diffusion coefficient of free MV++ within a ZMCPE is calculated to be about 8 × 10−11 cm2 s−1. This value increases (3 × 10−10 cm2 s−1) when the paste is equilibrated in high purity water for several hours before being used to obtain the “hydrated” form of a ZMCPE.
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Alain Walcarius, L. Lamberts, E.G. Derouane. The methyl viologen incorporated zeolite modified carbon paste electrode—part 1. Electrochemical behaviour in aqueous media. Effects of supporting electrolyte and immersion time. Electrochimica Acta, Elsevier, 1993, 38 (15), pp.2257-2266. ⟨10.1016/0013-4686(93)80107-B⟩. ⟨hal-01942070⟩

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