Fabrication and study of supercapacitor electrodes based on oxygen plasma functionalized carbon nanotube fibers
Fabrication and study of supercapacitor electrodes based on oxygen plasma functionalized carbon nanotube fibers
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DOI：
10.1016/j.jechem.2019.03.005
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发表时间：
2020-01-01
影响因子：
13.1
通讯作者：
Shanov, Vesselin
中科院分区：
文献类型：
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作者：
Adusei, Paa Kwasi;Gbordzoe, Seyram;Shanov, Vesselin
采用常压氧等离子体对干法制备的碳纳米管（CNT）纤维进行了表面改性。通过扫描电子显微镜（SEM）、拉曼光谱和X射线光电子能谱（XPS）对纤维进行了表征。从进行的电化学测量中发现，与非官能化纤维相比，官能化纤维显示出比电容增加132.8%。染料吸附测试和Randles-Sevcik曲线表明，氧等离子体功能化纤维表现出增加的表面积。通过Brunauer-Emmett-Teller（BET）测量进一步确定，CNT纤维的表面积在等离子体官能化之后从168.22 m2/g增加到208.01 m2/g。纤维的孔径分布也通过该处理而改变。电化学数据的改善归因于增强的润湿性、增加的表面积以及氧官能团的存在，这促进了纤维的电容。采用不同的电解质体系，由氧等离子体功能化的碳纳米管纤维电极制备纤维超级电容器。具有功能化电极的器件表现出优异的循环稳定性（400次循环后为93.2%）、柔性、可弯曲性和良好的能量密度。在0.5 mA/cm（2）时，EMIMBF 4器件的比电容分别比使用EMIMTFSI和H2SO 4电解质的器件的比电容大27%和65%。在这项工作中实践的等离子体表面处理可以用于其他应用中，其中纤维，纱线，带状物和片材需要进行化学改性。(C)2019年科学出版社和中国科学院大连化学物理研究所。由爱思唯尔公司和科学出版社出版。All rights reserved.
Dry-spun Carbon Nanotube (CNT) fibers were surface-modified by atmospheric pressure oxygen plasma functionalization using a well controlled and continuous process. The fibers were characterized by scanning electron microscopy (SEM), Raman spectroscopy, and X-ray Photoelectron Spectroscopy (XPS). It was found from the conducted electrochemical measurements that the functionalized fibers showed a 132.8% increase in specific capacitance compared to non-functionalized fibers. Dye-adsorption test and the obtained Randles-Sevcik plot demonstrated that the oxygen plasma functionalized fibers exhibited increased surface area. It was further established by Brunauer-Emmett-Teller (BET) measurements that the surface area of the CNT fibers was increased from 168.22 m(2)/g to 208.01 m(2)/g after plasma functionalization. The pore size distribution of the fibers was also altered by this processing. The improved electrochemical data was attributed to enhanced wettability, increased surface area, and the presence of oxygen functional groups, which promoted the capacitance of the fibers. Fiber supercapacitors were fabricated from the oxygen plasma functionalized CNT fiber electrodes using different electrolyte systems. The devices with functionalized electrodes exhibited excellent cyclic stability (93.2% after 400 0 cycles), flexibility, bendability, and good energy densities. At 0.5 mA/cm(2), the EMIMBF4 device revealed a specific capacitance, which is 27% and 65% greater than the specific capacitances of devices using EMIMTFSI and H2SO4 electrolytes, respectively. The practiced in this work plasma surface processing can be employed in other applications where fibers, yarns, ribbons, and sheets need to be chemically modified. (C) 2019 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.