Analyzing oxidation-reduction cycles using QCMB

1 Analyzing oxidation-reduction cycles using QCMB 

From the slope of this plot the apparent molar mass can be determined by multiplying the slope with Faraday s constant 

The oxidation-reduction process consists of several transport processes between polymer and electrolyte (i) the exchange of anions, (ii) the exchange of solvent molecules accompanying the anion transport, (iii) the exchange of cations, and (iv) the exchange of solvent molecules accompanying the cation transport. Therefore, consists of several terms. 

For some polymers only anion exchange is observed. Then P = 0 and a, associated with the exchange of solvent molecules with one anion, can be determined. For poly(-3, 4-ethylenedioxythiophene) in LiClO/acetonitrile a = — 1 was found. This means one perchlorate anion substitutes one acetonitrile molecule. The experiments are also possible in aqueous electrolytes. Results for different anions in aqueous electrolytes are shown in Table ll.l..  

Another example for the complex behavior of anion, cation, and solvent transport is the polypyrrole. Usually, anion, cation, and solvent transport can he observed, if this polymer is cycled in aqueous 0.1 mol-dm KCl electrolyte. How to separate the contributions of anion and solvent flux was described above. Additional techniques to separate the different contributions of ion and solvent fluxes are described in the literature. 

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