Porous carbon fibers from gel-spun polyacrylonitrile and poly(methyl methacrylate)-block-poly(acrylonitrile)
Porous carbon fibers from gel-spun polyacrylonitrile and poly(methyl methacrylate)-block-poly(acrylonitrile)
复制标题
DOI：
10.1016/j.carbon.2022.02.044
复制
发表时间：
2022-02
期刊：
影响因子：
10.9
通讯作者：
Jyotsna Ramachandran;Joel M. Serrano;Tianyu Liu;Jinwon Cho;Pedro J. Arias‐Monje;Mingxuan Lu;Mohammad H
中科院分区：
文献类型：
--
作者：
Jyotsna Ramachandran;Joel M. Serrano;Tianyu Liu;Jinwon Cho;Pedro J. Arias‐Monje;Mingxuan Lu;Mohammad H
嵌段共聚物（BCP）基多孔碳纤维代表了一种新兴的结构和功能材料，用于机械增强和电化学储能。本文以聚丙烯腈（PAN）和聚甲基丙烯酸甲酯-嵌段聚丙烯腈（PMMA-b-PAN）为前驱体，通过凝胶纺丝制备了一系列碳纤维，并对其形态、力学性能和电化学性能进行了系统研究。当在1315 °C下在张力下热解时，鞘中具有BCP的多孔碳纤维表现出1.1 GPa的拉伸强度、100 GPa的拉伸模量和10 mV s-1下的11 F g-1的电化学电容。在没有张力和800 °C的热解温度下，具有BCP作为皮和芯组分的纤维在10 mV s−1下达到70 F g− 1的最高电化学电容。通过热力学控制的计算方法计算PMMA-b-PAN的特征相关长度，提供了碳纤维中孔径的估计。除了热力学相分离之外，碳纤维中的孔生成及其尺寸还受动力学工艺参数驱动。这项研究表明，双组分PAN/PMMA-b-PAN纤维的凝胶纺丝提供了一种通用的手段，用于调整多孔碳纤维的机械和电化学性能，从而使其潜在的用途作为结构储能材料。
Block copolymer (BCP)-based porous carbon fibers represent an emerging structural and functional material for mechanical reinforcement and electrochemical energy storage. Herein, by gel-spinning polymer precursors of poly(acrylonitrile) (PAN) and poly(methyl methacrylate)-block-poly(acrylonitrile) (PMMA-b-PAN), we have produced a series of carbon fibers and systematically studied the morphological, mechanical, and electrochemical properties. Porous carbon fibers with BCP in the sheath exhibit a tensile strength of 1.1 GPa, tensile modulus of ∼190 GPa, and electrochemical capacitance of 11 F g−1at 10 mV s−1when pyrolyzed at 1315 °C under tension. Without tension and at a pyrolysis temperature of 800 °C, the fibers with BCP as both the sheath and core components achieve the highest electrochemical capacitance of 70 F g−1at 10 mV s−1. The characteristic correlation length of PMMA-b-PAN calculated through thermodynamically governed computational method, provides an estimate of pore size in the carbon fibers. Pore generation and their size in the carbon fibers were driven by kinetic processing parameters, in addition to the thermodynamic phase separation. This study shows that gel-spinning of bicomponent PAN/PMMA-b-PAN fibers provide a versatile means for tuning the mechanical and electrochemical properties of porous carbon fibers, thus allowing for their potential use as structural energy storage materials.