Abstract
The influence of different divalent cations (M2+) on the electrochemical charging/discharging process of polypyrrole/sulfate (PPy/SO4) films has been investigated. In principle, two different types of M2+ were found: (a) cations that cause the break-in phenomenon in the PPy film during electrochemical cycling with a gradual increase of film electroactivity and (b) cations in whose solutions the PPy film remains mainly electroinactive. Certain correlations have been drawn between several physico-chemical properties of the investigated cations and the break-in and passivation phenomena. The break-in and passivation phenomena were found to be influenced by the size and deformability of the cation hydration shell, ion covalent index and softness, as well as by the pH value of the test solution.
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Hallik, A., Alumaa, A. & Tamm, J. On the break-in and passivation phenomena in polypyrrole/sulfate films. J Solid State Electrochem 14, 909–916 (2010). https://doi.org/10.1007/s10008-009-0995-y
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DOI: https://doi.org/10.1007/s10008-009-0995-y