کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
192577 459746 2010 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrochemical performances of poly(3,4-ethylenedioxythiophene)–NiFe2O4 nanocomposite as electrode for supercapacitor
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Electrochemical performances of poly(3,4-ethylenedioxythiophene)–NiFe2O4 nanocomposite as electrode for supercapacitor
چکیده انگلیسی

Poly 3,4-ethylenedioxythiophene (PEDOT)-based NiFe2O4 conducting nanocomposites were synthesized and their electrochemical properties were studied in order to find out their suitability as electrode materials for supercapacitor. Nanocrystalline nickel ferrites (5–20 nm) have been synthesized by sol–gel method. Reverse microemulsion polymerization in n-hexane medium for PEDOT nanotube and aqueous miceller dispersion polymerization for bulk PEDOT formation using different surfactants have been adopted. Structural morphology and characterization were studied using XRD, SEM, TEM and IR spectroscopy. Electrochemical performances of these electrode materials were carried out using cyclic voltammetry at different scan rates (2–20 mV/s) and galvanostatic charge–discharge at different constant current densities (0.5–10 mA/cm2) in acetonitrile solvent containing 1 M LiClO4 electrolyte. Nanocomposite electrode material shows high specific capacitance (251 F/g) in comparison to its constituents viz NiFe2O4 (127 F/g) and PEDOT (156 F/g) where morphology of the pore structure plays a significant role over the total surface area. Contribution of pseudocapacitance (CFS) arising from the redox reactions over the electrical double layer capacitance (CDL) in the composite materials have also been investigated through the measurement of AC impedance in the frequency range 10 kHz–10 mHz with a potential amplitude of 5 mV. The small attenuation (∼16%) in capacitance of PEDOT–NiFe2O4 composite over 500 continuous charging/discharging cycles suggests its excellent electrochemical stability.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 55, Issue 16, 30 June 2010, Pages 4677–4684
نویسندگان
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