Electropolymerization of pyrrole in propylene carbonate on zinc electrodes modified by heteropolyanions
Electropolymerization of pyrrole in propylene carbonate on zinc electrodes modified by heteropolyanions
- Synthetic Metals, 65(1), p.27-34, 1994 .
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.
ELECTROPOLYMERIZATION
PYRROLE
ZINC
ELECTRODES
HETEROPOLYANIONS
SURFACES
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.
ELECTROPOLYMERIZATION
PYRROLE
ZINC
ELECTRODES
HETEROPOLYANIONS
SURFACES