Electrochemical degradation of polyaniline

The effect of low temperature treatment on electrochemical activity of polyaniline

“…Reaction with oxygen during heating was reportedly occurred, but its relative contribution to the observed spectral changes was not quantified. Although these investigations on chemical stability due to the effect of thermal treatment [6][7][8][9][10][11][12][13][14], and also electrochemical stability due to the effect of electrochemical oxidation [15][16][17][18][19] have been reported, studies on the effect of thermal treatment on electrochemical stability are scarcely reported [20]. The thermal stability studies include thermogravimetric analysis, differential scanning calorimetry, conductivity studies, solubility, spectroscopy, and X-ray diffraction [6][7][8][9][10][11][12][13][14].…”

“…The thermal stability studies include thermogravimetric analysis, differential scanning calorimetry, conductivity studies, solubility, spectroscopy, and X-ray diffraction [6][7][8][9][10][11][12][13][14]. In studies of electrochemical oxidation [15][16][17][18][19], PANI coated metal electrodes have been held at known potentials higher than 0.5 V vs. SCE for a certain duration and changes in cyclic voltammograms in the potential range of its electrochemical activity have been recorded. Stilwell and Park [15] have studied degradation of PANI due to electrochemical oxidation and have identified p-benzoquinone as a major degradation product, which is soluble in an acidic electrolyte.…”

Electrochemical behavior of a new electroactive polyimide derived from aniline trimer

“…Polyaniline degradation in an aqueous solution has been studied extensively. [12][13][14] Due to the hydrolysis of the quinonediimine moiety in polyaniline, p-benzoquinone is formed and subsequently reduced during the redox cycle, which displays a reversible peak (a so-called middle peak) between the two typical pairs of original peaks shown in a cyclic voltammogram. In a nonaqueous system, the same degradation also has been observed, although it is slower than in an aqueous system.…”

Ionophore/Lipid Bilayer Assembly on Soft Organic Electrodes for Potentiometric Detection of K+ Ions

“…The composition of the electrolyte medium has also been found to influence the redox mechanism, since both the cation and anion present participate in the PANI redox mechanism Genies 1990). Electrogravimetric studies in aqueous media (DeSilvestra 1992, Kabumoto 1988 have shown that the mass of PANI polymer increases during oxidation (charging) and decreases during reduction (discharging) for the first redox couple. Mass changes depend upon the molecular weight of the anion, and there is not effect from the cation, this is an indication that the anions present in solution are combined into the polymer films to compensate for the positive charges resulting from the oxidation from LEB to ES, and then driven out during subsequent reduction.…”

“…The fluidity and stability of the solid-supported membranes planar surfaces have a distinct advantage over freestanding "black lipid" membranes or spherical lipid vesicles models because it makes it possible to carry out experiments and use analytical methods that are difficult or impossible to use with other model systems. Methods like total interference fluorescence, nuclear magnetic resonance (NMR), Fourier-transform infrared spectroscopy, Surface Plasmon resonance, and X-ray and neutron scattering can all be used to probe the structural and dynamic properties of solid supported membranes (Kalb 1992, Baruerl 1990, Tatulian 1995, Terretaz 1993, Kjaer 1987, Kalb 1990, Majeski 1998.…”