Tong Fenglian, Jia Wei, Pan Yanliang, Guo Jixi, Ding Lili, Chen Jingjing, Jia Dianzeng
Laboratory of Energy Materials Chemistry, Ministry of Education, Key Laboratory of Advanced Functional Materials, Autonomous Region, Institute of Applied Chemistry, Xinjiang University Urumqi 830046 Xinjiang P. R. China
RSC Adv. 2019 Feb 20;9(11):6184-6192. doi: 10.1039/c8ra08949c. eCollection 2019 Feb 18.
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 at 1.0 A g in 6 M KOH, a good rate performance with a capacitance of 220.3 F g at 20.0 A g 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. 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.
设计了一种从煤中制备分级多孔碳纳米纤维的绿色方法。在这项工作中，去离子水、煤、聚乙烯醇和普朗尼克F127分别用作纺丝的水溶液、碳源、纺丝助剂和软模板。作为超级电容器的电极材料，所制备的分级多孔碳纳米纤维在6 M KOH中，1.0 A g时表现出265.2 F g的高比电容，具有良好的倍率性能，在20.0 A g时电容为220.3 F g，保持率为83.1%，并且在10.0 A g下经过20000次充/放电循环后具有优异的循环稳定性，无电容损失。与未使用普朗尼克F127构建的碳纳米纤维相比，该样品增强的电化学性能得益于更大的接触表面积、普朗尼克F127分解形成的介孔结构以及良好的结构稳定性。这项工作不仅为煤在储能中的高值利用提供了一条绿色途径，还为从煤制备用于超级电容器电极的具有高比电容和长循环寿命的分级多孔碳纳米纤维开辟了一条新道路。
