Mesoporous carbons with ultrahigh nitrogen content were prepared for supercapacitors through the hard template method. Silica nanoparticles were used as the hard template, and ethylenediamine and CCl₄ served as precursor. Large amount of mesopores were generated through removing the silica nanoparticles with HF. The effect of carbonization temperature on the pore structure and nitrogen content and thus on the capacitive performance of supercapacitors were investigated. It was found that the higher carbonization temperature leads to an initial increase and then decrease of specific surface area and a continuous decrease in N content. The sample carbonized at 700 °C (NC700) shows the highest capacitance (306 F g⁻¹) due to the higher surface area (533 m² g⁻¹) and ultrahigh N content (18.06%). The increase in specific surface area results in improvement of double-layer capacitance, while the N element increases the pseudocapacitance and the wettability of the carbons. In addition, NC700 shows excellent stability with 96.6% capacitance retention even after 10,000 cycles at a current density of 3 A g⁻¹.

通过硬模板法制备了具有超高氮含量的中孔碳用于超级电容器。二氧化硅纳米颗粒用作硬模板，乙二胺和CCl ₄用作前体。通过用HF去除二氧化硅纳米粒子，产生了大量的中孔。研究了碳化温度对孔结构和氮含量的影响，进而对超级电容器的电容性能的影响。已经发现，较高的碳化温度导致比表面积的初始增加然后减小，并且N含量连续减少。在700°C下碳化的样品（NC700 ）由于具有较高的表面积（533 m ²  g ）而具有最高的电容（306 F g ^-1）^-1）和超高N含量（18.06％）。比表面积的增加导致双层电容的改善，而N元素增加了伪电容和碳的可湿性。另外，即使在电流密度为3 A g ^{-1的条件下}进行10,000次循环之后，NC700仍具有出色的稳定性和96.6％的电容保持率。