Influence of supporting electrolyte concentration and composition on formal potentials and entropies of redox couples incorporated in Nafion coatings on electrodes

Clay-Modified Electrodes: A Review

“…The shift in potential is a function of the magnitude of the trivalent/N.a § exchange constant. Naegeli et aL (1986) showed that the potential shift in Nation (a cation-exchange polymer)-modified electrode should shift by 59 mV per decade in the electrolyte concentration. This shift is shown as line AB in Figure 4.…”

Nafion® as advanced immobilisation substrate for the voltammetric analysis of electroactive microparticles: the case of some artistic colouring agents

“…The CV characteristics of PB film have been already studied [31][32][33][34]. By this comparison, the peak systems can be ascribed to the reversible redox reactions 1 (AA' system) and 2 (CC' system) [42,43].…”

“…In comparison to potassium, the penetration of the larger hydrated sodium cation into the PB lattice is expected to be more difficult [37,38]. Feldman et al [43] studied the electron diffusion coefficient (D e ) in mixed-valence PB films in various electrolytes and observed a noticeable difference in dependence of the presence of Na + or of K + in the supporting electrolyte. Indeed, D e for Na + and K + are equal to 0.80×10 −9 and 3.9×10 −9 cm 2 /s, respectively [43].…”

Voltammetric Analysis of Pesticides

“…They were first introduced by Ghosh and Bard (1983) to elucidate charge phenomena in the film, and the effect of the film structure on the mobility of the electrochemical probe to the electrode surface (Naegeli et al, 1986;Subramanian & Fitch, 1992;Fitch et al, 1996). This particular type of electrodes has been actively investigated for its potential applications in electrocatalysis (Premkumar & Ramaraj, 1997;Moronta, 2004;Paramasivam & Anandhan, 2005), in the electroanalysis of organic and inorganic compounds (Ballarin et al, 2000;Jieumboue et al, 2009) and in biochemical analysis (Coche-Guerente et al 1998;Mbouguen et al 2007).…”

“…This particular type of electrodes has been actively investigated for its potential applications in electrocatalysis (Premkumar & Ramaraj, 1997;Moronta, 2004;Paramasivam & Anandhan, 2005), in the electroanalysis of organic and inorganic compounds (Ballarin et al, 2000;Jieumboue et al, 2009) and in biochemical analysis (Coche-Guerente et al 1998;Mbouguen et al 2007). It has been shown that the diffusion of an electroactive species within the film at a CFME depends on several factors such as the pore structure of the film, the size of the probe, its concentration, the ionic strength and the composition of the supporting electrolyte (Naegeli et al, 1986;Fitch et al 1996). Two main approaches are usually used to build CFMEs: (i) the spin-coating of a colloidal suspension enriched with clay particles, (ii) the drop-coating on the active surface of the electrode of the clay suspension, both followed by drying either in air or in an oven at a given temperature.…”