Electrochemical and X-ray diffraction studies on polypyrrole films

被引：8
|
作者：
Pruneanu, S
Graupner, W
Oniciu, L
Brie, M
Turcu, R
机构：
[1] GRAZ TECH UNIV,INST FESTKORPERPHYS,A-8010 GRAZ,AUSTRIA
[2] UNIV CLUJ,FAC CHEM,R-3400 CLUJ NAPOCA,ROMANIA
[3] INST CHEM,CLUJ NAPOCA 3400,ROMANIA
来源：
MATERIALS CHEMISTRY AND PHYSICS | 1996年 / 46卷 / 01期
关键词：
redox kinetics; X-ray scattering; polypyrrole anisotropy;
D O I：
10.1016/0254-0584(96)80130-1
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The redox behaviour of polypyrrole (PPY) films doped with perchlorate (ClO4-) or p-toluene sulfonate (TsO(-)) anions was studied by cyclic voltammetry. The values of the kinetic parameters I-0, alpha(A) and alpha(C) (exchange current density, anodic and cathodic transfer coefficients) were obtained using Tafel equations. We report a decrease in the I-0 value after each redox scan, in contrast with the alpha(A) and alpha(C) values, which remain almost constant. We attribute this variation of the I-0 value to the irreversible trapping of cations (Li+ or H+) in the polymer layer, after the reduction process. X-ray diffraction measurements evidenced an anisotropic molecular organization of PPY (TsO(-)), in contrast with PPY( ClO4-), which exhibits an isotropic structure.
引用
收藏
页码：55 / 60
页数：6
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