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Electropolymerization of pyrrole in propylene carbonate on zinc electrodes modified by heteropolyanions

Tipo de material: TextoTextoSeries ; Synthetic Metals, 65(1), p.27-34, 1994Trabajos contenidos:
  • Zaid, B
  • Aeiyach, S
  • Lacaze, P.C
Tema(s): Recursos en línea: Resumen: The electropolymerization of pyrrole on a zinc electrode was studied in different organic and aqueous media, such as acetonitrile (MeCN), propylene carbonate (PC), methanol (MeOH)and water in the presence of various ammonium salts with PF6-, CIO4-, Br-, BF4- or pars-toluene sulfonate (TsO-)anions. Polypyrrole (PPy)film formation was achieved only in PC with TsO- anions and when the zinc electrode was chemically or electrochemically treated with heteropolyanions (HPA), such as (H2WlsO56F6)Hs-9H20, P2W18062H6-9H20 and PWI204oH 3. In other media, electropolymerization failed and the zinc electrode was oxidized to Zn 2÷. Analysis of the films by IR, Raman, XPS and SEM confirmed that standard PPy films were obtained with a conductivity of about 30 S cm-1. Adhesion of PPy to the substrate was relatively poor but could be improved drastically by thermal treatment.
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The electropolymerization of pyrrole on a zinc electrode was studied in different organic and aqueous media, such as acetonitrile (MeCN), propylene carbonate (PC), methanol (MeOH)and water in the presence of various ammonium salts with PF6-, CIO4-, Br-, BF4- or pars-toluene sulfonate (TsO-)anions. Polypyrrole (PPy)film formation was achieved only in PC with TsO- anions and when the zinc electrode was chemically or electrochemically treated with heteropolyanions (HPA), such as (H2WlsO56F6)Hs-9H20, P2W18062H6-9H20 and PWI204oH 3. In other media, electropolymerization failed and the zinc electrode was oxidized to Zn 2÷. Analysis of the films by IR, Raman, XPS and SEM confirmed that standard PPy films were obtained with a conductivity of about 30 S cm-1. Adhesion of PPy to the substrate was relatively poor but could be improved drastically by thermal treatment.

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