کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1287683 1498009 2013 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis of large surface area carbon xerogels for electrochemical double layer capacitors
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Synthesis of large surface area carbon xerogels for electrochemical double layer capacitors
چکیده انگلیسی

A resorcinol–formaldehyde (R–F) condensation reaction catalyzed by acetic acid (C) is employed to prepare carbon xerogels for electrochemical double layer capacitors. The samples are fabricated with an R:F ratio of 1:2 and R:C ratio of 10:1, followed by solvent exchange, pyrolysis, and carbon dioxide activation. The solvent exchange allows negligible structure contraction upon drying, and after pyrolysis and carbon dioxide treatment, we are able to produce porous carbons with a surface area of 3419 m2 g−1. Image from scanning electron microscope reveals an interconnected foam-like structure and BET confirms the presence of excessive micro- and mesopores. Electrochemical analysis including cyclic voltammetry (CV), current reversal chronopotentiometry (CRC), and impedance spectroscopy are conducted using a titanium cavity electrode so relevant capacitive characteristics and kinetic parameters could be determined. Both CV and CRC results indicate specific capacitances and life time behaviors that are comparable or even better than those of Black Pearl 2000. For example, the specific capacitance is 324.8 F g−1 in 0.5 M H2SO4 aqueous solution at ±1 A g−1 for potential window of 0–1 V. In contrast, sample without carbon dioxide activation displays a similar morphology but its surface area and specific capacitance are reduced considerably to 449 m2 g−1 and 34.7 F g−1, respectively.


► Improved formula for resorcinol–formaldehyde condensation to produce porous carbon structure.
► Solvent exchange and carbon dioxide activation to fabricate carbon xerogels with surface area of 3419 m2 g−1.
► Specific capacitance and life time comparable or better than Black Pearl 2000.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 223, 1 February 2013, Pages 147–154
نویسندگان
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