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首页> 外文期刊>International Journal of Electrochemical Science >Oxygen-rich Hierarchical Porous Carbon Derived from Coal Tar Pitch for Superior Electric Double Layer Capacitor Application
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Oxygen-rich Hierarchical Porous Carbon Derived from Coal Tar Pitch for Superior Electric Double Layer Capacitor Application

机译：煤焦油沥青衍生的富氧分层多孔碳，可用于高级双层电容器

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摘要

Coal tar pitch (CTP) with a great deal of polynuclear aromatic structural units is a potential precursorfor preparing porous carbon. In this paper, CTP was selected as raw material, and oxygen-richhierarchical porous carbon (OHPC) was prepared successfully by facile one-step KOH activation,which was attributed to the H2O oxidation during this process. The oxygen content in hierarchicalporous carbon was well above the oxygen content in CTP. Besides, possible oxidation mechanism wasproposed. The influence of activation temperature and activation ratio (mKOH/mCTP) on the porestructure of OHPC was also investigated, and the largest specific surface area reached 2342 m2 g-1.When OHPC was applied to electric double layer capacitor in the two electrode system, it shows goodelectrochemical performance. Its specific capacitance and energy density could reach 308 F g-1 and8.31 Wh kg-1 in 6 M KOH solution, respectively. Meanwhile, the capacitance retention of OHPCs wasup to 95.4% at 2 A g-1 after 10000 cycles. This paper not only provides a simple method of oxygendoping for porous carbon, but also achieve the green and high value-added utilization of CTP.
机译：具有大量多核芳族结构单元的煤焦油沥青（CTP）是制备多孔碳的潜在前体。本文以CTP为原料，通过简单的一步式KOH活化法成功制备了富氧多级多孔碳（OHPC），这归因于该过程中H2O的氧化作用。分层多孔碳中的氧含量远高于CTP中的氧含量。此外，提出了可能的氧化机理。还研究了活化温度和活化比（mKOH / mCTP）对OHPC孔结构的影响，最大比表面积达到2342 m2 g-1。当将OHPC应用于双电极系统的双电层电容器时，它显示出良好的电化学性能。在6 M KOH溶液中，其比电容和能量密度分别可以达到308 F g-1和8.31 Wh kg-1。同时，在10000次循环后，在2 A g-1下OHPC的电容保持率高达95.4％。本文不仅为多孔碳提供了一种简单的氧掺杂方法，而且实现了CTP的绿色环保和高附加值利用率。

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