کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
186297 459610 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of ion-exchange on the electrochemical properties of polypyrrole films
ترجمه فارسی عنوان
تأثیر مبادله یون بر خواص الکتروشیمیایی فیلم های پلی پیلر
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


• NO3−, Cl−, ClO4− replace sulfonate anions in polypyrrole easily by self-exchange.
• Ion-exchange with SO42− results in modification of polypyrrole inner structure.
• Redox capacitance of polypyrrole films is significantly increased by ion-exchange.

Cyclic voltammetry, X-ray microanalysis (EDS), FTIR, and AFM were applied for the systematic examination of the influence of self-exchange and potential stimulated ion-exchange on the electrochemical properties of polypyrrole (PPy) films prepared in the presence of benzene sulfonate (BS), para-toluene sulfonate (pTS), and naphthalene-1, 5-disulfonate (NDS) anions. All electrochemical experiments were carried out in aqueous solutions. It was established that small inorganic anions, like NO3−, Cl−, ClO4− can relatively easily replace an essential part of the sulfonates in PPy/BS and PPy/pTS films simply during a 10 min polarization at 0.4 V. A single potentiodynamic cycle increases the completeness of the exchange of the anions remarkably. The EDS analysis carried out before and after the anion exchange showed that 5–15% of the sulfonate anions still remain in the PPy films. The ability of the double-charged SO42− anions to replace sulfonate anions is even more pronounced as the exchange process does not need additional electrochemical activation. The quantum chemical model calculations have shown that the interaction of the sulfate anions with charged pyrrole oligomers is essentially stronger compared to other anions under the study.The redox capacitance and the corresponding electrochemical doping level of the redoped PPy films are remarkably higher than those before ion-exchange, showing that the PPy matrix formed in the presence of sulfonate anions does not collapse after ion-exchange and it creates favorable conditions for increased mobility of inorganic anions.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 122, 10 March 2014, Pages 79–86
نویسندگان
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