Abstract In this paper, a method to fabricate structural N-doped hierarchical porous carbon is proposed. KOH and melamine are found to have synergistically impact on the pore-creating and nitrogen-doping process. The targeted product possesses specific surface area of 2642 m2 g−1 with a highly promoted inner surface area. The specific capacitance increases from 364 to 715 F g−1 at the current density of 1 A g−1 in a two-electrode system using 6 M KOH electrolyte. It also shows the good rate capability (526 F g−1 at 100 A g−1) and cycle performance (98.28% retention after 5000 cycles at 5 A g−1). The energy density reaches 118 W h kg−1 at the power density of 200 W kg−1. The high specific capacitance is mostly derived from the electrical double-layer capacitance, which is a significant advantage compared to the conventional surface doping. The nitrogen atoms stably embedded into the carbon skeleton. N-5 hindered the energy storage process, while N-Q showed obvious impact both on the specific capacitance and cycle performance. All in all, a high-performance electrode material for supercapacitor is provided in this study and it also provides a brand-new idea for the structural doping porous carbon.

中文翻译：

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用于超级电容器的高性能结构 N 掺杂分级多孔碳的制备

摘要 本文提出了一种制备结构N掺杂分级多孔碳的方法。发现 KOH 和三聚氰胺对孔隙形成和氮掺杂过程具有协同影响。目标产品具有 2642 m2 g-1 的比表面积和高度提升的内表面积。在使用 6 M KOH 电解质的双电极系统中，当电流密度为 1 A g-1 时，比电容从 364 F g-1 增加到 715 F g-1。它还显示出良好的倍率性能（100 A g-1 时为 526 F g-1）和循环性能（5 A g-1 时 5000 次循环后保留率为 98.28%）。在 200 W kg-1 的功率密度下，能量密度达到 118 W h kg-1。高比电容主要来自双电层电容，与传统的表面掺杂相比，这是一个显着的优势。氮原子稳定嵌入碳骨架中。N-5阻碍了能量存储过程，而NQ对比电容和循环性能都有明显影响。总之，本研究提供了一种用于超级电容器的高性能电极材料，也为结构掺杂多孔碳提供了一个全新的思路。