Kim Jisu, Heo Youn-Ji, Hong Jin-Yong, Kim Sung-Kon
School of Semiconductor and Chemical Engineering, Jeonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, Korea.
Carbon Industry Frontier Research Center, Korea Research Institute of Chemical Technology (KRICT), Daejeon 34114, Korea.
Materials (Basel). 2020 Feb 5;13(3):729. doi: 10.3390/ma13030729.
Porous carbon electrodes that accumulate charges at the electrode/electrolyte interface have been extensively investigated for use as electrochemical capacitor (EC) electrodes because of their great attributes for driving high-performance energy storage. Here, we report porous carbon nanofibers (p-CNFs) for EC electrodes made by the formation of a composite of monodisperse silica nanoparticles and polyacrylonitrile (PAN), oxidation/carbonization of the composite, and then silica etching. The pore features are controlled by changing the weight ratio of PAN to silica nanoparticles. The electrochemical performances of p-CNF as an electrode are estimated by measuring cyclic voltammetry and galvanostatic charge/discharge. Particularly, the p-CNF electrode shows exceptional areal capacitance (13 mF cm at a current of 0.5 mA cm), good rate-retention capability (~98% retention of low-current capacitance), and long-term cycle stability for at least 5000 charge/discharge cycles. Based on the results, we believe that this electrode has potential for use as high-performance EC electrodes.
由于在电极/电解质界面处积累电荷的多孔碳电极具有驱动高性能储能的优异特性，因此已被广泛研究用作电化学电容器（EC）电极。在此，我们报道了一种用于EC电极的多孔碳纳米纤维（p-CNFs），其制备方法是先形成单分散二氧化硅纳米颗粒与聚丙烯腈（PAN）的复合材料，对该复合材料进行氧化/碳化，然后蚀刻二氧化硅。通过改变PAN与二氧化硅纳米颗粒的重量比来控制孔隙特征。通过测量循环伏安法和恒电流充放电来评估p-CNF作为电极的电化学性能。特别是，p-CNF电极在0.5 mA cm的电流下表现出优异的面积电容（13 mF cm）、良好的倍率保持能力（低电流电容保持率约为98%）以及至少5000次充放电循环的长期循环稳定性。基于这些结果，我们认为这种电极具有用作高性能EC电极的潜力。
