کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6656967 | 461667 | 2015 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Lignite-derived high surface area mesoporous activated carbons for electrochemical capacitors
ترجمه فارسی عنوان
کربن فعال مزرعه ای برای خازن های الکتروشیمیایی به دست آمده از سنگ های قیمتی
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
چکیده انگلیسی
Mesoporous activated carbons (ACs) were successfully prepared from lignite using KOH as activation agent at the temperature above 700 °C. The pore structure and surface chemistry of the as-prepared ACs were characterized by means of nitrogen adsorption-desorption, X-ray diffraction, scanning electron microscope, transmission electron microscope and X-ray photoelectron spectroscopy. The results show that such prepared mesoporous ACs have a high specific surface area (~ 3036 m2·gâ 1) with a hierarchical macro-meso-micro-pore structure and oxygen-enriched surface. The electrochemical performances of the ACs as electrode materials for electrochemical capacitors (ECs) were assessed by galvanostatic charge-discharge, cyclic voltammetry and cycling durability tests. It was demonstrated that the mesoporous ACs produced in this study possessed a maximum specific capacitance of 355 F·gâ 1 and 196 F·gâ 1 in 3 M KOH aqueous and 1 M (C2H5)4NBF4/PC organic electrolytes, respectively, at a current density of 50 mA·gâ 1, and exhibited a desirable energy and power density with a superior cycling performance. The excellent capacitive behavior of the prepared mesoporous ACs in aqueous system is attributed to their unique macro-meso-micro-hierarchical pore structure with high surface area and oxygen-containing surface. Their superb electrochemical performance in the organic electrolyte is attributed to their well-developed mesoporous structure.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fuel Processing Technology - Volume 138, October 2015, Pages 734-742
Journal: Fuel Processing Technology - Volume 138, October 2015, Pages 734-742
نویسندگان
Bao-Lin Xing, Hui Guo, Lun-Jian Chen, Zheng-Fei Chen, Chuan-Xiang Zhang, Guang-Xu Huang, Wei Xie, Jiang-Long Yu,