Department of Chemistry and Biochemistry, The University of Texas at Dallas, 800 W. Campbell Road, Richardson, TX 75080, United States of America.
Nanotechnology. 2019 Apr 12;30(15):155402. doi: 10.1088/1361-6528/aafe95. Epub 2019 Jan 15.
Flexible, free standing and binder-free electrodes were fabricated by electrospinning from a series of lignin: polyvinyl alcohol (PVA) polymer blends, followed by heat treatment. PVA has the dual function of facilitating the electrospinning of lignin and acting as a sacrificial polymer. Upon stabilization, carbonization and CO activation, carbon nanofibers (ACNF) derived from the lignin:PVA 80:20 blend displayed a high surface area of 2170 m g and a mesopore volume of 0.365 cm g. ACNFs derived from all the compositions show high degrees of graphitization based on Raman analysis. PyrTFSI ionic liquid (IL), modified by mixing with propylene carbonate and ethylene carbonate to reduce the viscosity and increase the ionic conductivity, was used as a high-performance electrolyte. The resulting IL mixture exhibited a four-fold increase in ionic conductivity compared to the neat IL Coin cell supercapacitors using electrodes derived from lignin:PVA 80:20 blends and this electrolyte displayed 87 F g specific capacitance and 38 Wh kg energy density which is the highest reported energy density for lignin:PVA blends to date.
聚乙烯醇（PVA）聚合物共混物中制造出柔性、自立和无粘结剂的电极，然后进行热处理。PVA 具有促进木质素静电纺丝和作为牺牲聚合物的双重功能。在稳定化、碳化和 CO 活化后，来自木质素：PVA 80:20 共混物的碳纤维纳米纤维（ACNF）显示出 2170 m²/g 的高表面积和 0.365 cm³/g 的中孔体积。所有组成部分衍生的 ACNF 都基于拉曼分析显示出高度石墨化程度。将吡啶三氟甲磺酰亚胺离子液体（IL）与碳酸丙烯酯和碳酸乙烯酯混合以降低粘度和增加离子电导率，用作高性能电解质。与纯 IL 相比，所得 IL 混合物的离子电导率增加了四倍，使用来自木质素：PVA 80:20 共混物的电极的 Coin 电池超级电容器显示出 87 F/g 的比电容和 38 Wh/kg 的能量密度，这是迄今为止报道的木质素：PVA 共混物的最高能量密度。
