کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
196651 459848 2006 10 صفحه PDF سفارش دهید دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of microcrystallite structures on electrochemical characteristics of mesoporous carbon electrodes for electric double-layer capacitors
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موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Effect of microcrystallite structures on electrochemical characteristics of mesoporous carbon electrodes for electric double-layer capacitors
چکیده انگلیسی

The effect of microcrystallite structures on electrochemical characteristics of mesoporous carbon electrodes was investigated by using nitrogen gas adsorption method, high resolution transmission electron microscopy, X-ray diffractometry (XRD), AC-impedance spectroscopy and cyclic voltammetry (CV). For this purpose, the carbon specimens with various microcrystallite structures were prepared using different carbonaceous precursors and varying heat-treatment temperature. The sizes of the microcrystallite in a- and c-axis direction, La and Lc, were quantitatively estimated from Scherrer's equation using the XRD patterns. From the analysis of the impedance spectra, it was found that the value of constant phase element exponent α decreased with increasing Lc/La, indicating that the frequency dispersion of capacitance increases with increasing amounts of the edge planes, i.e., with increasing surface inhomogeneity. Moreover, the value of specific double-layer capacitance Cd determined at the lowest frequency in the impedance spectra increased with increasing Lc/La, which is attributable to the higher value of Cd for the edge planes than that for the basal planes. From the results of the CVs, it is concluded that the ion penetration into the pores is closely related to Lc/La during double-layer charging/discharging of the carbon specimens, that is, the larger the value of Lc/La is, the lower exhibits the rate capability γ, thus causing more retardation of the ion penetration into the pores.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 51, Issue 15, 1 April 2006, Pages 3029–3038
نویسندگان
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