| 萃取温度对无灰煤结构及煤基活性炭电化学性能的影响 | |
| Effect of Extraction Temperature on Hyper-coal Structure and Electrochemistry of Coal-Based Activated Carbon | |
| 摘要: 以内蒙古褐煤为原料，N-甲基吡咯烷酮为萃取剂，在不同温度下萃取制备无灰煤，进而利用KOH活化法制备活性炭，探究萃取温度对活性炭电化学性能的影响。结果表明，无灰煤萃取温度对煤基活性炭电化学性能有显著影响。对无灰煤及原料褐煤的灰分含量，表面官能团含量和对应活性炭的比表面积、孔结构及其电化学性能进行对比发现，330℃下萃取制备出的无灰煤在碱煤质量比3：1，活化温度650℃，活化时间2h的活化过程中具备最适宜的反应性，对应活性炭比表面积高达1 252 m2· g-1，表面官能团含量适中，在3 mol·L-1 KOH电解液中50 mA·g-1电流密度下比电容高达322 F·g-1，2 A·g-1的电流密度下比电容保持率仍可接近90%。 | |
| 关键词: 无灰煤 活性炭 萃取温度 超级电容器 活化 | |
| 基金项目: 国家自然科学基金（No.21506047）和河北省自然科学基金（No.B2017209240，E2018209310）资助项目 | |
| Abstract: The Inner Mongolia lignite was used to prepare hyper-coal(HPC) at different temperatures by N-methylpyrolidone during KOH extraction. To explore the effect of extraction temperatures on activated carbons(ACs), the activation was operated at the same condition, mKOH:mcoal=3:1 and activated at 650℃ for 2 hours. The results show that the extraction temperature of HPC has great effect on the electrochemical properties of HPC-based ACs. Comparing the ash contents, surface oxo-functional groups, the specific surface areas, pore structures and electrochemical performances of the corresponding ACs with the lignite, the HPC prepared at 330℃ is in possession of the most suitable reactivity and its specific surface area of corresponding ACs could reach 1 252 m2·g-1 with appropriate amount of surface oxo-function groups. Besides, the specific capacitor could still retain almost 90% in 3 mol·L-1 KOH electrolyte at 50 mA·g-1 reaching 322 F·g-1, and a capacity retention as high as near 90% was achieved at 2 000 mA·g-1. | |
| Keywords: hyper-coal activated carbon extraction temperature supercapacitor activated | |
| 投稿时间：2018-04-16 修订日期：2018-06-14 | |
| 摘要点击次数: 2031 | |
| 全文下载次数: 1337 | |
| 郭秉霖,侯彩霞,樊丽华,孙章.萃取温度对无灰煤结构及煤基活性炭电化学性能的影响[J].无机化学学报,2018,34(9):1615-1624. | |
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