کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
206863 461201 2010 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nitrogen-enriched bituminous coal-based active carbons as materials for supercapacitors
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Nitrogen-enriched bituminous coal-based active carbons as materials for supercapacitors
چکیده انگلیسی

The paper presents the results of a study on obtaining N-enriched active carbons from bituminous coal and on testing its use as an electrode material in supercapacitors. The coal was carbonised, activated with KOH and ammoxidised by a mixture of ammonia and air at the ratio 1:3 at 300 °C or 350 °C, at different stages of the production, that is, at those of precursor, carbonisate, and active carbon. The products were microporous N-enriched active carbon samples of well-developed surface area reaching from 1577 to 2510 m2/g and containing 1.0 to 8.5 wt% of nitrogen. The XPS measurements have shown that in the active carbons enriched in nitrogen at the stage of precursor and at the stage of carbonisate, the dominant nitrogen species are the N-5 groups, while in the samples ammoxidised at the last stage of the treatment the dominant nitrogen species are the surface groups of imines and/or nitriles, probably accompanied by amines and amides. The paper reports the results of a comprehensive study of the effect of the structure and chemical composition of a series of active carbon samples of different properties on their capacity performance in water solutions of H2SO4 or KOH, with the behaviour of positive and negative electrodes analysed separately.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fuel - Volume 89, Issue 11, November 2010, Pages 3457–3467
نویسندگان
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