氮掺杂介孔碳的制备及其电化学超电容性能（英文）

Synthesis and Electrochemical Supercapacitive Properties of Nitrogen-Doped Mesoporous Carbons

通过直接炭化沸石咪唑酯骨架结构材料(ZIF-8)纳米多面体,成功制备了氮掺杂介孔碳(NMCs).采用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射(XRD)、拉曼光谱、X射线光电子能谱(XPS)及比表面和孔隙度分析仪对其微观形貌和结构进行了表征,并对NMCs的电化学超电容性能进行了测试.结果表明:NMCs具有规整的形貌、介孔纳米结构和较大比表面积(2737 m2·g-1);由于氮元素掺杂所赋予的优异的表面润湿性和赝电容性能,且介孔结构有利于电解质到达电极活性材料表面,NMCs表现出优异的电化学超电容性能,在1A·g-1的电流密度下,1.0 mol·L-1H2SO4溶液中的比电容值为307 F·g-1,并具有良好的功率特性;此外,在10 A·g-1的大电流密度下充放电循环5000次后,NMCs的比电容值保持率为96.9%.

Nitrogen-doped mesoporous carbons （NMCs） were synthesized by direct carbonization of zeolitic imidazolate framework-8 （ZIF-8） nanopolyhedrons. The surface morphology and structure were characterized by scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, X-ray diffraction （XRD）, Raman spectroscopy, X-ray photoelectron spectroscopy （XPS）, and surface area and pore size analyzer. The electrochemical supercapacitive properties of the NMCs were also investigated. The results showed that the NMCs had a uniform morphology, mesoporous nanostructure, and high surface area （2737 m2·g-1）. On the other hand, based on the excellent surface wettability, pseudocapacitive behavior and electrolyte accessibility resulted from N-doping and the mesoporous structure, the NMCs exhibited excellent electrochemical supercapacitive properties：a high specific capacitance （307 F·g-1 in 1.0 mol·L-1 H2SO4 solution, at 1 A·g-1）, good power characteristics, and satisfactory stability （the capacitance retained ratio was 96.9%after 5000 cycles even at a high current density of 10 A·g-1）.