کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6602855 | 1424081 | 2018 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Heteroatom doping and activation of carbon nanofibers enabling ultrafast and stable sodium storage
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Heteroatom doping and activation of carbon nanofibers enabling ultrafast and stable sodium storage Heteroatom doping and activation of carbon nanofibers enabling ultrafast and stable sodium storage](/preview/png/6602855.png)
چکیده انگلیسی
Activation is a common strategy to tailor microstructure of carbon materials. A new activation combined with heteroatom doping of carbon nanofibers is proposed to synthesize the N, S-doped carbon nanofibers (NSCNFs). After electrospinning and followed thermal treatment with thiourea, the diameter of the as-obtained NSCNFs decreases with much more abundant pore structure and functionalized with S-containing oxygen groups compared with that obtained without activation. The increased specific surface area and pore volume are beneficial to facilitate the Na+ diffusion and provide more active sites to increase adsorption capacitance and facilitate pseudo-capacitive reactions. Also, the S-containing oxygen groups contribute to pseudo-capacitance by faradaic reactions. As a result, capacitive behavior is boosted hence leading to a excellent rate capability and cycling stability. The flexible and freestanding NSCNFs film is directly used as anode for sodium-ion batteries (NIBs) and shows excellent rate capability with reversible capacity of 147 and 133â¯mAâ¯hâ¯g-1 at 10 and 30â¯Aâ¯gâ1, respectively. Remarkably, ultra-long cyclic life is also achieved with 90.8% capacity retention after 6000 cycles at 10â¯Aâ¯gâ1. Such electrochemical performance makes NSCNFs promising to be used in high power and durable NIBs. This activation strategy can also be expanded to functionalize other carbon materials.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 276, 20 June 2018, Pages 304-310
Journal: Electrochimica Acta - Volume 276, 20 June 2018, Pages 304-310
نویسندگان
Yue Bao, Yuping Huang, Xiong Song, Jin Long, Suqing Wang, Liang-Xin Ding, Haihui Wang,