کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1521054 | 1511800 | 2015 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Supercapacitive evaluation of carbon black/exfoliated graphite/MnO2 ternary nanocomposite electrode by continuous cyclic voltammetry
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A new ternary nanocomposite was prepared by using MnO2, carbon black (CB), and exfoliated graphite (EG) through a sonochemical method. In this process, the MnO2 nanoparticles was anchored on the mixture of CB and EG to maximize the specific capacitances of these materials. Structure and morphology of the CB/EG/MnO2 nanocomposites were examined by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electrochemical properties of the CB/EG/MnO2 nanocomposites with different content of MnO2 were studied by cyclic voltammetry (CV), fast Fourier transformation continuous cyclic voltammetry (FFTCCV) technique, galvanostatic charge-discharge, and electrochemical impedance spectroscopy (EIS). The best nanocomposite electrode displayed specific capacitance of 364Â FÂ gâ1 at the scan rate of 2Â mVÂ sâ1 in 0.5Â M Na2SO4 aqueous solution, which is higher than pure MnO2 (289Â FÂ gâ1). The capacitance stability of the nanocomposite electrode was studied by FFTCCV at the scan rate of 500Â mVÂ sâ1. The result shows that after recording 4000 CVs, the specific capacitance of the nanocomposite decline only 5%. Furthermore, the nanocomposite electrode showed higher energy density than MnO2 electrode.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volume 163, 1 August 2015, Pages 38-44
Journal: Materials Chemistry and Physics - Volume 163, 1 August 2015, Pages 38-44
نویسندگان
Hamid Reza Naderi, Parviz Norouzi, Mohammad Reza Ganjali,