کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
221222 463379 2006 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The effect of low temperature treatment on electrochemical activity of polyaniline
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
The effect of low temperature treatment on electrochemical activity of polyaniline
چکیده انگلیسی

The effect of heating of polyaniline (PANI) at 80 °C on its electrochemical activity is studied. Although the thermogravimetric analysis indicates that PANI is stable at temperatures up to about 250 °C and it undergoes decomposition at higher temperatures, its intrinsic redox electrochemical activity decreases with duration of heating at a temperature as low as 80 °C. The polymer completely loses its electrochemical activity. This behavior of PANI is studied by recording cyclic voltammetry and electrochemical impedance spectroscopy at different intervals of heating time. Furthermore, the electrochemical activity of PANI towards the redox reaction Fe2+/Fe3+ also decreases similarly. The decrease in electrochemical activity of PANI is attributed to an irreversible loss of water molecules. The reaction order degradation of PANI is found to be close to unity, and a value of 1.44 × 10−4 s−1 is obtained for the rate constant. The deactivated PANI does not recover its electrochemical activity even after a prolonged treatment in acidic electrolytes.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electroanalytical Chemistry - Volume 595, Issue 1, 15 September 2006, Pages 78–86
نویسندگان
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