کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7740919 | 1497991 | 2013 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Facile chemical synthesis of nitrogen-doped graphene sheets and their electrochemical capacitance
ترجمه فارسی عنوان
سنتز شیمیایی لایه ای از صفحات گرافن دوتایی نیتروژن و ظرفیت الکتروشیمیایی آنها
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کلمات کلیدی
دوپینگ نیتروژن، گرافن، خازنی خاص، کارکردن کاهش اکسید گرافین،
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
چکیده انگلیسی
To improve the electrochemical performance of graphene materials, nitrogen-doped graphene sheets (NGS) were simultaneously reduced and functionalized with nitrogen (N) doping from graphene oxide (GO) by a simple process using 1Â wt.% ammonia water solution as the reducing agent, nitrogen precursor and solvent. The NGS were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy-energy dispersive spectroscopy microanalysis, and differential scanning calorimetry. The thermal stability of NGS was much higher than that of GO. The N content in NGS was 4.4Â at.% and a maximum specific capacitance up to 233.3Â FÂ gâ1 was obtained at 0.5Â AÂ gâ1. At 0.02Â VÂ sâ1, the NGS exhibited a specific capacitance of 140.3Â FÂ gâ1, which was over 8 times that of GO and nearly 2 times that of graphene without N-doping. These results revealed that N-doping of functional graphene provide remarkable improvements on the electrochemical capacitive performance of graphene materials. The NGS also showed high cycle stability of capacitive performance.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 241, 1 November 2013, Pages 460-466
Journal: Journal of Power Sources - Volume 241, 1 November 2013, Pages 460-466
نویسندگان
Xusheng Du, Cuifeng Zhou, Hong-Yuan Liu, Yiu-Wing Mai, Guoxiu Wang,