Nitrogen-doped worm-like graphitized hierarchical porous carbon designed for enhancing area-normalized capacitance of electrical double layer supercapacitors
Nitrogen-doped worm-like graphitized hierarchical porous carbon designed for enhancing area-normalized capacitance of electrical double layer supercapacitors
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氮掺杂蠕虫状石墨化分级多孔碳设计用于增强双电层超级电容器的面积归一化电容
DOI：
10.1016/j.carbon.2017.02.087
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发表时间：
2017-06
期刊：
影响因子：
10.9
通讯作者：
Chen Xiaohua
中科院分区：
文献类型：
--
作者：
Liu Zheng;Xiao Kuikui;Guo Hui;Ning Xiaohua;Hu Aiping;Tang Qunli;Fan Binbin;Zhu Yanfei;Chen Xiaohua
双电层超级电容器（EDLC）具有面积归一化电容（CA）的上限，并导致阻碍高能量密度超级电容器装置商业化的瓶颈。量子电容（CQ）与双电层电容（CEDL）串联已被证明是提高EDLC CA的巨大障碍。氮掺杂可以使费米能级上移，石墨化可以提高态密度，这两种方法都可以显著降低CQ的限制作用。在这里，开发了一种简便的方法来合成一个理想的碳基EDLC电极材料，通过简单地添加硫酸亚铁七水合物（FSH）到聚合物时，胶体聚集。通过改变FSH的比例，可以很容易地调节样品的形貌、孔结构、石墨化度、掺杂N含量以及掺杂N的种类。优化后的石墨化多孔碳纳米管（NWHC-GE）具有极高的CA（1A g− 1时为24.6 μF cm− 2，100 A g−1时为18.5 μF cm− 2）。这表明了一种提高CA的方法，并为突破碳基材料的极限比电容提供了一种潜在的策略。
Electrical double layer supercapacitors (EDLC) have an upper limit for their area-normalized capacitance (CA) and lead to a bottleneck that impede the commercialization of high-energy-density supercapacitor devices. Quantum capacitance (CQ) in series with electrical double layer capacitance (CEDL) has been demonstrated to be a tremendous obstacle for enhancing theCAof EDLC. Nitrogen doping can up-shift the Fermi-level and graphitization can improve the density of states (DOS), both of which can significantly mitigate the limiting influence ofCQ. Here, a facile approach is developed for synthesizing an ideal carbon-based EDLC electrode material by simply adding ferrous sulfate heptahydrate (FSH) into the polymer when colloid aggregation. The morphology, porous structure, graphitization degree, doped N content and the types of the doped N of the samples can be easily tuned through changing the FSH ratio. The optimized nitrogen doped worm-like hierarchical porous carbon with graphitized porous carbon embossment (NWHC-GE) exhibits an exceptionally highCA(24.6 μF cm−2at 1 A g−1and 18.5 μF cm−2at 100 A g−1). This demonstrates a way to enhance theCAand provides a potential strategy for breaking through the limiting specific capacitance of carbon-based materials.
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影响因子：
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