کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1291905 973375 2006 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Cresol–formaldehyde based carbon aerogel as electrode material for electrochemical capacitor
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Cresol–formaldehyde based carbon aerogel as electrode material for electrochemical capacitor
چکیده انگلیسی

Carbon aerogels have been prepared through a polycondensation of cresol (Cm) with formaldehyde (F) and an ambient pressure drying followed by carbonization at 900 °C. Modification of the porous structures of the carbon aerogel can be achieved by CO2 activation at various temperatures (800, 850, 900 °C) for 1–3 h. This process could be considered as an alternative economic route to the classic RF gels synthesis. The obtained carbon aerogels have been attempted as electrode materials in electric double-layer capacitors. The relevant electrochemical behaviors were characterized by constant current charge–discharge experiments, cyclic voltammetry and electrochemical impedance spectroscopy in an electrolyte of 30% KOH aqueous solution. The results indicate that a mass specific capacitance of up to 78 F g−1 for the non-activated aerogel can be obtained at current density 1 mA cm−2. CO2 activation can effectively improve the specific capacitance of the carbon aerogel. After CO2 activation performed at 900 °C for 2 h, the specific capacitance increases to 146 F g−1 at the same current. Only a slight decrease in capacitance, from 146 to 131 F g−1, was observed when the current density increases from 1 to 20 mA cm−2, indicating a stable electrochemical property of carbon aerogel electrodes in 30% KOH aqueous electrolyte with various currents.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 162, Issue 1, 8 November 2006, Pages 738–742
نویسندگان
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