Textural and electrochemical characterization of porous carbon nanofibers as electrodes for supercapacitors
Textural and electrochemical characterization of porous carbon nanofibers as electrodes for supercapacitors
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DOI：
10.1016/j.jpowsour.2007.07.009
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发表时间：
2007-10-11
影响因子：
9.2
通讯作者：
Li, Yuan-Yao
中科院分区：
文献类型：
--
作者：
Huang, Chao-Wei;Wu, Yung-Tai;Li, Yuan-Yao
以聚乙二醇和氯化镍为催化剂，采用热分解法制备了富含石墨结构的多孔纳米碳纤维。多孔碳纳米纤维的织构和电化学性能进行了系统的比较与商业上可获得的多壁碳纳米管（MWCNTs）。与MWCNTs相比，多孔碳纳米纤维具有较高的比表面积，其高的中孔比例和大量的开放边缘有利于电解质的渗透，同时多孔碳纳米纤维的石墨烯层也是电子良好的导电介质。采用循环伏安法、恒电流充放电法和电化学阻抗谱分析等方法对多孔碳纳米纤维和多壁碳纳米管的电化学性能进行了表征。多孔碳纳米纤维的电容性能（在25 mV s（-1）时C-s = 98.4 F g（-1），在1.31 kHz时表现为电容器的起始频率）优于多壁碳纳米管的电容性能（C-s = 17.8 F g（-1），在1.01 kHz时表现为电容器的起始频率）。这项工作证明了多孔碳纳米纤维的电化学超级电容器的应用前景的电容性能。(C)2007 Elsevier B. V.保留所有权利。
Porous carbon nanofibers (CNFs) enriched with the graphitic structure were synthesized by thermal decomposition from a mixture containing polyethylene glycol and nickel chloride (catalyst). The textural and electrochemical properties of porous CNFs were systematically compared with those of commercially available multi-walled carbon nanotubes (MWCNTs). The high ratio of mesopores and large amount of open edges of porous CNFs with a higher specific surface area, very different from that of MWCNTs, are favorable for the penetration of electrolytes meanwhile the graphene layers of porous CNFs serve as a good electronic conductive medium of electrons. The electrochemical properties of porous CNFs and MWCNTs were characterized for the application of supercapacitors using cyclic voltammetry, galvanostatic charge-discharge method, and electrochemical impedance spectroscopic analyses. The porous CNFs show better capacitive performances (C-s = 98.4 F g(-1) at 25 mV s(-1) and an onset frequency of behaving as a capacitor at 1.31 kHz) than that of MWCNTs (C-s = 17.8 F g(-1) and an onset frequency at 1.01 kHz). This work demonstrates the promising capacitive properties of porous CNFs for the application of electrochemical supercapacitors. (C) 2007 Elsevier B.V. All rights reserved.