Electrochemical properties of PANI films for different counter-ions in acidic pH analysed by impedance techniques

Effects of anion size on the electrochemical behavior of H2SO4-structured poly(o-toluidine) films. An ac-electrogravimetry study in acid solutions

“…because the nature of anions influences the motion of charge carriers (P or BP) along the chains [33]. The results show that NO 3 is always transferred faster than ClO 4 at all the studied polarization potentials.…”

“…A great amount of attention has been paid to understand the effect of the size and mobility of the incorporated anions in ICPs [22][23][24][25][26][27][28][29][30][31][32][33]. In particular, a significant influence of the dopant type on the properties of polyaniline and its derivatives has been reported.…”

“…Generally, the most of studies of these films are focused on the transfer of charge carriers because they are directly related to the electrical response. Larger anions decrease the conductivity of electrogenerated films [22,[33][34][35]. Likewise, other responses can be marked by the anion identity, which lead to compact or open film structures during the polymerization [26], increase the grow rates of polymerization [28], slow the color response [29], increase the stiffness [24] and increase the mean πconjugated length [23] of films.…”

Frequency Dispersion of Double Layer Capacitance of Polyaniline-Coated Electrodes Under the Conducting State

“…There are some complications (Deslouis, et al, 1999) that avoid unique interpretation especially for PANi films. They include (a) redox reactions which convert the states between the insulator and the conductor, (b) a function of electrically conducting porous PANi films as an electrode (Ren, et al, 1995), (c) hysteresis responding to such a long applied voltage change (Heinze, et al, 1987;Feldberg, et al, 1988) that it can be expressed quantitatively by logarithmic time-dependence Odin, et al, 1992), (d) undistinguished Faradaic currents from capacitive ones (Heinze, et al, 1988;Feldberg, 1984), which has been extensively discussed (MacDiarmid, et al, 1989), and (e) complicated contribution of ions (Deslouis, et al, 1999;Benyaich, et al, 1996). Item (a) is coupled with (b) to expand or shrink the conducting zone over the film, called the propagation of the conducting zone (Aoki, et al, 1992;.…”

EIS study of the redox reaction of Fe(CN)63−/4− at poly(3,4-ethylenedioxythiophene) electrodes: influence of dc potential and cOx:cRed ratio

“…These models were later extended to take into consideration both ion and electron transfer at the polymerjsolution interface [27]. Because of the more complicated experimental arrangement, considerably less work has been focused on free standing polymer membranes, in the so-called symmetric configuration of solutionjpolymerjsolution [29][30][31][32][33]. In this paper the asymmetric configuration has been used, i.e., a conducting polymer-modified electrode in contact with a supporting electrolyte solution containing a redox couple (Ox/Red).…”