کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
11005934 | 1497832 | 2018 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A flexible supercapacitor consisting of activated carbon nanofiber and carbon nanofiber/potassium-pre-intercalated manganese oxide
ترجمه فارسی عنوان
یک ابررسانای انعطاف پذیر که شامل نانو فایبر کربن فعال و نانوکامپوزیت کربن / اکسید منگنز پیش از پتاسیم است
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
چکیده انگلیسی
Potassium-pre-intercalated δ-phase MnO2 is uniformly grown on carbon nanofibers for the positive electrode of asymmetric supercapacitors. An electrospun CNF is chemically activated with KOH at 800â¯Â°C for the negative electrode, showing ideal capacitive behavior. The crystallinity of MnO2 is significantly reduced by the pre-intercalation of K ions into its layered structure. This textural characteristic is beneficial to the K+ diffusion into/out the interlayer structure, leading to effective utilization of the electroactive material of KxMnO2. This unique composite electrode provides both ideal pseudo-capacitive behavior from KxMnO2 and excellent electric conductivity from the CNF network, exhibiting a fairly high specific capacitance value of 279â¯Fâ¯g-1â¯at 1â¯Aâ¯gâ1 with ca. 82.3% capacitance retention from 1 to 32â¯Aâ¯gâ1. A flexible ASC consisting of the positive KxMnO2@CNF electrode, a paper separator, and the negative ACNF electrode is successfully assembled. This cell shows superior ASC performances: a high cell voltage between 0 and 2â¯V, excellent capacitance retention (10,000 cycles with 10% decay), and simultaneously reaching high specific energy and power of 21.1â¯Wh kgâ1 and 9.5â¯kWâ¯kgâ1. The charge storage behavior of this cell without bending and with a bending angle of 90° shows no apparent difference, demonstrating its potential in the next-generation flexible energy storage devices.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 400, 1 October 2018, Pages 415-425
Journal: Journal of Power Sources - Volume 400, 1 October 2018, Pages 415-425
نویسندگان
Sheng-Chi Lin, Yi-Ting Lu, Jeng-An Wang, Chen-Chi M. Ma, Chi-Chang Hu,