کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7740640 | 1497992 | 2013 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Polypyrrole-covered MnO2 as electrode material for supercapacitor
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
γ-MnO2 has been synthesized by hydrothermal process, and studied as electrode material in aqueous asymmetric super-capacitor. We studied the blend formed by electrochemical polymerization of pyrrole deposited onto γ-MnO2 particles. The composite materials (PPy/MnO2) were characterized by different methods including cyclic voltammetry, chronoamperometry, X-ray diffractometry and BET measurements. The specific capacitance at constant current density 2 mA cmâ2 was calculated from galvanostatic charge-discharge cycling tests. The asymmetric super-capacitor using (PPy/MnO2) composite material has high specific capacitance of 141.6 F gâ1 compared with 73.7 F gâ1 for γ-MnO2 before PPy coating. The improvement of the coating is not only due to the electronic conductivity of the polymer, but also due to an increase of the BET surface area that raises to 125 m2 gâ1 after coating, against 64 m2 gâ1 for pristine MnO2.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 240, 15 October 2013, Pages 267-272
Journal: Journal of Power Sources - Volume 240, 15 October 2013, Pages 267-272
نویسندگان
A. Bahloul, B. Nessark, E. Briot, H. Groult, A. Mauger, K. Zaghib, C.M. Julien,