基于碳酸镁模板的氮掺杂多孔炭的制备及其电化学性能

Preparation and Electrochemical Performance of Nitrogen-Doped Porous Carbon with MgCO_3 as Template

以碳酸镁为模板、聚苯胺为炭源、聚乙二醇为粘接剂,通过简单的炭化过程制得氮掺杂多孔炭(C2)。以聚苯胺直接炭化物(C1)作为对比样。使用扫描电镜、透射电镜、N2吸脱附、热重、红外光谱、拉曼光谱、X射线衍射谱、X光电子能谱等手段对样品进行了表征。结果表明,多孔的C2样品比表面积为249.8 m^2/g,远比C1的(19.8 m^2/g)高。C1和C2中的氮原子含量(原子分数)接近,分别为5.48%和4.8%。较高的比表面积和一定的氮掺杂使C2具有良好的电化学电容行为。在电流密度为1 A/g的条件下C2的比电容为268 F/g,经过8000圈的充放电循环(电流密度为4 A/g)表现出极好的电化学稳定性。

N-doped porous carbon（C2） was prepared by simple carbonization process with MgCO3 as template, synthesized polyaniline（PANI） as carbon source and polyethylene glycol（PEG） as binder.Meanwhile, PANI was directly carbonized to prepare（C1） for comparison. The morphology, structure and composition of the prepared porous carbon were characterized by scanning electron microscopy, transmission electron microscopy, N2 adsorption, thermogravimetry, Fourier transform infrared spectroscopy,Raman spectroscopy, X-ray powder diffraction and X-ray photoelectron spectroscopy. Results show that specific surface area of C2 is 249.8 m2/g, far higher than that of C1（19.8 m2/g）. The N-contents of the two porous carbons were similar i.e. 5.48%（C1） and 4.8%（C2）, respectively. Both of the high specific surface area and certain amount of N-doping endowed C2 with good electrochemical capacitive properties.The specific capacitance of C2 is 268 F/g by current density of 1 A/g. Besides, the N-doped porous carbon（C2） exhibited excellent stability after 8000 cycles of charge-discharge by current density of 4 A/g.