کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9776509 | 1509487 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The electrochemical activity of sulfonic acid ring-substituted polyaniline in the wide pH range
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
بیومتریال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Polyaniline (PAn) film can directly react with the concentrated sulfuric acid to form sulfonic acid ring-substituted polyaniline (SPAn). Based on the cyclic voltammograms, the electrochemical behavior of SPAn is the same as that of PAn in the acid solution at pH <1, but is quite different from that of PAn in the basic solution. The cyclic voltammograms of SPAn in 0.3Â M Na2SO4 solution with various pH values indicate that there are an anodic peak and two cathodic peaks at pH 10.6 when the scan rate was set at 60Â mVÂ sâ1. The electrochemical behavior of SPAn is affected by the potential scan rate. At the scan rate of 6Â mVÂ sâ1, two pairs of redox peaks occur on the cyclic voltammogram of SPAn in the solution of pH 10.6. In this case, its usable potential range is between 0.0 and 0.65Â V (versus SCE). Based on the area of the cyclic voltammogram, a 44.8% of the electrochemical activity of SPAn is still retained when the SPAn electrode moved from pH 5.0 to 10.6. SPAn has a conductivity of 4.3Â SÂ cmâ1, which is slightly dependent on pH when equilibrated with water. SPAn can react with alcohol to form the ester followed by hydrolization, which gives a straightforward evidence for the sulfonation of polyaniline. The FTIR spectra reveal a fact that polyaniline immersed in the concentrated sulfuric acid can be sulfonated, and the sulfonic acid group can be removed from SPAn by the reaction of SPAn with alcohol.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Synthetic Metals - Volume 149, Issues 2â3, 31 March 2005, Pages 143-149
Journal: Synthetic Metals - Volume 149, Issues 2â3, 31 March 2005, Pages 143-149
نویسندگان
Chunmei Li, Shaolin Mu,