Cyclic and steady-state voltammetric studies of the mechanism and kinetics of some solute inorganic redox-species reactions at a gold electrode covered with poly-o-phenylenediamine

Electrochemical copolymerization of o-toluidine and o-phenylenediamine

“…1d). Levi and Pisarevskaya [32] and Wu et al [33] have reported similar observations. On the basis of spectroelectrochemical studies they have assigned the redox pair at 0.00/À0.03 V to the reversible oxidation and reduction of reduced and semioxidized forms (Scheme 2a) and the redox pair at 0.00/0.12 V to the oxidation and reduction of the semioxidized and highly unstable total oxidized forms (Scheme 2b) of POPD, respectively.…”

Electrochemical activity and microscopy of electrosynthesised poly(o-phenylenediamine) nanotubes

“…The anodic peak (A) at −0.09 V and the corresponding The existence of three redox states of PoPD during its redox process has been proposed. The redox pair (A-A') at −0.09 V/-0.18 V was assigned to the reversible oxidation and reduction of reduced and semioxidized forms (see Scheme 2) and the second one (B/B') at 0.35 V/-0.07 V to the oxidation and reduction of the semi-oxidized and highly unstable total-oxidized forms of PoPD (Scheme 2), respectively [20][21][22].…”

Redox mediation at electroactive polymer coated electrodes: Mechanistic diagnosis criteria from steady state polarization curves

“…In occasions, there is a pre-wave with a E 1/2 equal to that of the external redox couple [12][13][14][15]. Very often, the limiting current at the mediator is smaller than that at the bare electrode [6,[11][12][13][14]. It also happens that, as X is increased, the limiting current is smaller than that predicted by Levich's equation [6,[11][12][13].…”

“…Sometimes there is a cathodic current but the anodic one is absent and vice versa [11][12][13]. In occasions, there is a pre-wave with a E 1/2 equal to that of the external redox couple [12][13][14][15]. Very often, the limiting current at the mediator is smaller than that at the bare electrode [6,[11][12][13][14].…”

“…Usually, the half wave potential, E 1/2 , lies between that of the external redox couple and that of the mediator [6,11]. Sometimes there is a cathodic current but the anodic one is absent and vice versa [11][12][13]. In occasions, there is a pre-wave with a E 1/2 equal to that of the external redox couple [12][13][14][15].…”