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A green approach to prepare hierarchical porous carbon nanofibers from coal for high-performance supercapacitors

机译：一种绿色的方法，可从煤炭制备分级多孔碳纳米纤维，以用于高性能超级电容器

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摘要

A green method is designed to obtain hierarchical porous carbon nanofibers from coal. In the work, deionized water, coal, polyvinyl alcohol and Pluronic F127 are used as the aqueous solution, carbon source, spinning assistant and soft template for spinning, respectively. As electrode materials for supercapacitors, the obtained hierarchical porous carbon nanofibers exhibit a high specific capacitance of 265.2 F g ~(?1) at 1.0 A g ~(?1) in 6 M KOH, a good rate performance with a capacitance of 220.3 F g ~(?1) at 20.0 A g ~(?1) with the retention of 83.1% and a superior cycle stability without capacitance loss after 20?000 charge/discharge cycles at 10.0 A g ~(?1) . Compared with the carbon nanofibers constructed without Pluronic F127, the enhanced electrochemical performance of the sample benefits from a larger contact surface area and the mesoporous structure formed by decomposition of Pluronic F127 and good structural stability. This work not only provides a green route for high-value utilization of coal in energy storage, but also paves a new way to make hierarchical porous carbon nanofibers from coal for supercapacitor electrodes with high specific capacitance and long cycle life.
机译：设计一种绿色方法从煤中获得分级的多孔碳纳米纤维。在工作中，分别使用去离子水，煤，聚乙烯醇和Pluronic F127作为水溶液，碳源，纺丝助剂和用于纺丝的软模板。作为超级电容器的电极材料，所获得的多层多孔碳纳米纤维在6 M KOH中的1.0 A g〜（？1）时显示出265.2 F g〜（？1）的高比电容，良好的倍率性能和220.3 F g〜（？1）在20.0 A g〜（？1）时具有83.1％的保留率，并且在10.0 A g〜（？1）进行20〜000次充/放电循环后，具有出色的循环稳定性而无电容损失。与不使用Pluronic F127构造的碳纳米纤维相比，样品的增强的电化学性能得益于较大的接触表面积和Pluronic F127分解形成的介孔结构以及良好的结构稳定性。这项工作不仅为在储能中煤炭的高价值利用提供了一条绿色路线，而且为从煤炭中制备具有高比电容和长循环寿命的超级电容器电极用多层碳纳米纤维铺平了道路。

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