中文摘要：

氮掺杂多孔碳（NPC）电极材料具有特殊的多孔结构,导致其比表面积高,化学稳定性好,同时电容性能良好,然而导电性差,能量密度低等因素也限制了其实际应用。以天然产物为碳源,经高温热解产生碳化残渣,将这些残渣经筛分,与氢氧化钾和三聚氰胺一起混合、研磨,然后再经过高温焙烧、洗涤、烘干后得到NPC样品。该样品外观为黑色粉末,在扫描电镜下观察其形貌呈现多孔状,氮元素含量达到6.45wt%。将NPC与乙炔黑、聚偏氟乙烯按8∶1∶1的质量比制成电极压片,可组装成对称型超级电容器。在两电极体系下,以6M KOH为电解液,通过恒电流充放电（GCD）和循环伏安（CV）测试表明：电流密度为0.1A/g时,组装的超级电容器的比电容达到145F/g,而且当功率密度为50W/kg时,能量密度可达到20Wh/kg。经1000次循环充放电后,其比电容仍然保持96.9%,库仑效率基本稳定在99%,说明NPC具有优良的电容特性和循环稳定性。

英文摘要：

The electrode material comprised of nitrogen-doped porous carbon （NPC） owns many advantages such as a high specific surface area, a good chemical stability and an exceUent capacitive performance. However, its practical applications have been restricted to a certain extent owing to the poor electrical conductivity, low energy density and etc. Here we report a NPC material synthesized by using a kind of natural product as carbon resource, which was carbonized and then sieved into fine carbide powder. After mixing the fine carbide powder with KOI-I and melamine, grinding and then calcination at a high temperature, the obtained black powder sample presents a porous morphology, besides, the nitrogen doping content reaches 6.45wt%. Electrodes were fabricated by mixing the NPC, acetylene black and PTFE binder in a mass ratio of 8 ： 1 ： 1, and thus a symmetric two-electrode supercapacitor device was assembled. The capacitance performance of the device was characterized by galvanostatic charge-discharge （GCD） and cyclic vohammetry （CV） tests in a two-electrode system while 6M KOH used as an electrolyte. The supercapacitor shows a specific capacitance of 145F/g at the current density of 0.1A/g and an energy density of 20Wh/kg at the power density of 50W/kg. The capacitance retention of 96.9% as well as a high coulombic efficiency of 99% is achieved after 1000 charge-discharge cycles, which indicates the as-synthesized NPC has both an excellent capacitive property and a superior cycle stability.