磷掺杂介孔碳的制备及其电化学性能

以酚醛树脂为碳前驱体,磷酸为磷源,三嵌段共聚物F127为软模板,通过溶剂挥发诱导自组装(EISA)法制备了具有介孔结构的磷掺杂介孔碳(PMCs)。通过场发射扫描电子显微镜(FE-SEM)、透射电子显微镜(TEM)、X射线衍射(XRD)和X射线光电子能谱(XPS)等测试方法研究所制备的PMCs的形貌与结构并利用电化学工作站测试其电化学性能。实验结果表明,磷元素在介孔碳中主要以C—P键和P—O键两种形式存在。电化学测试表明,通过调整磷掺杂量可获得最大比电容。当电流密度为0.5 A/g时,介孔碳比电容为140 F/g,而优化后的磷掺杂介孔碳比电容可达176 F/g。

Preparation of Phosphorus-Doped Mesoporous Carbon and Its Electrochemical Property

Phosphorus-doped mesoporous carbons (PMCs) were synthesized by solvent evaporation-induced self-assembly (EISA) method using phenolic resin as carbon precursor, phosphoric acid as phosphorus source, and the triblock copolymer F127 as soft template. The morphology and structure of the prepared PMCs were characterized by field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The electrochemical properties of samples were tested by electrochemical workstation. The results show that phosphorus mainly exists in the form of C—P bond and P—O bond in mesoporous carbon. Electrochemical tests show that the maximum specific capacitance can be obtained by adjusting the amount of phosphorus doping. When the current density is 0.5 A/g, the specific capacity of mesoporous carbon is 140 F/g, while the optimized mesoporous carbon reaches 176 F/g.