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Synergistic effects of pitch and poly(methyl methacrylate) on the morphological and capacitive properties of MnO 2 /carbon nanofiber composites
Journal of Electroanalytical Chemistry ( IF 4.5 ) Pub Date : 2018-01-01 , DOI: 10.1016/j.jelechem.2017.12.063
Ji Hwan Jeong , Bo-Hye Kim

Abstract Porous electrically conducting carbon nanofibers with MnO2 (P-Pitch-PM-Mn) are prepared by electrospinning blended solutions of pitch, poly(methyl methacrylate) (PMMA), manganese(II) chloride (MnCl2), and polyacrylonitrile (PAN) in N,N-dimethylformamide (DMF), and their electrochemical properties are investigated as supercapacitor electrodes. In these nanofiber composites, the pitch plays a key role in developing the surface area and electrical conductivity, whereas the mesopore volume fraction is increased with PMMA addition. These characteristics afford the P-Pitch-PM-Mn composite with the best electrochemical performance as a material for supercapacitor electrodes with a maximum specific capacitance of 183 F g− 1 at 1 mA cm− 2, high energy densities of 25–20 W h kg− 1 in the power density range of 400 to 10,000 W kg− 1, and good rate capability in aqueous solution. Thus, the combination of large specific surface area, high conductivity, and suitable mesoporosity induced by pitch and PMMA improves the electrochemical performance of the P-Pitch-PM-Mn electrodes through the effective charge accumulation at the electrode/electrolyte double-layer interfaces and rapid pathways for electrolyte transportation.

中文翻译:

沥青和聚甲基丙烯酸甲酯对MnO 2 /碳纳米纤维复合材料形态和电容性能的协同作用

摘要 通过电纺沥青、聚甲基丙烯酸甲酯 (PMMA)、氯化锰 (II) (MnCl2) 和聚丙烯腈 (PAN) 的混合溶液制备含 MnO2 的多孔导电碳纳米纤维 (P-Pitch-PM-Mn)。 N,N-二甲基甲酰胺 (DMF) 及其作为超级电容器电极的电化学性能进行了研究。在这些纳米纤维复合材料中,沥青在提高表面积和电导率方面起着关键作用,而中孔体积分数随着 PMMA 的加入而增加。这些特性使 P-Pitch-PM-Mn 复合材料作为超级电容器电极的材料具有最佳电化学性能,在 1 mA cm−2 时的最大比电容为 183 F g− 1,能量密度为 25-20 W h kg− 1 在 400 至 10,000 W kg−1 的功率密度范围内,在水溶液中具有良好的倍率能力。因此,沥青和 PMMA 诱导的大比表面积、高电导率和合适的介孔率的结合通过电极/电解质双层界面处的有效电荷积累提高了 P-Pitch-PM-Mn 电极的电化学性能和电解质运输的快速途径。
更新日期:2018-01-01
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