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Electrochemical Characterization Of A Polypyrrole/Montmorillonite Nanocomposite
Published 1997 · Chemistry
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The electrochemical activities of films prepared from chemically synthesized polypyrrole and a polypyrrole/montmorillonite nanocomposite are examined using cyclic voltammetry and chronopotentiometry. The nanocomposite exhibits redox chemistry at potentials (V p,c = -1500, V p,a = -1100 mV) approximately 1 V more negative than in native polypyrrole. Chronopotentiometric studies show that the capacities of these two materials, when evaluated in terms of mass of polymer, are similar, and that the charge/discharge plateaus are also shifted by approximately 1 V. Two models are proposed to explain these results, one based on the inductive effect of the encasing anionic sheets, and one on a redox mechanism involving cation insertion.