一步法合成具有二级孔道的有序介孔碳材料及其超电容性能研究.doc

一步法合成具有二级孔道的有序介孔碳材料及其超电容性能研究 廖书田1　郑明波1　高静贤1,2　曹　謇1　杨振江1　陈惠钦1　曹洁明1*　陶　杰1 (1·南京航空航天大学材料科学与技术学院,纳米材料研究所,南京210016;2江苏省医疗器械检验所,南京210012) 摘　要　以酚醛树脂低聚物为碳前驱体,三嵌段共聚物F127为模板剂,在此过程中加入正硅酸乙酯为硅源,900℃下炭化得到具有介孔结构的碳-SiO2复合物,除SiO2后得到具有二级孔道结构的介孔碳材料。对样品进行透射电子显微镜、N2吸附-脱附表征,并利用循环伏安以及恒电流充放电研究了样品的超电容性能。结果表明,样品具有二级孔道结构,BET比表面积为1657·6m2·g-1,比电容值161·3F·g-1。相比于单一孔道的介孔碳材料,二级孔道结构的介孔碳的循环伏安曲线更接近于矩形,比电容值有了很大提高,随着放电电流的增大其比电容值衰减率更小。 关键词　超级电容器,一步法,介孔碳材料,二级孔道 One-step prepartion of ordered mesoporous carbon with secondary pore structure and its supercapacitance characteristics Liao Shutian1　Zheng Mingbo1　Gao Jingxian1,2　Cao Jian1 Yang Zhenjiang1　Chen Huiqin1　Cao Jieming1　Tao Jie1 (1·Institute of Nanomaterials Research, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016;2·Jiangsu Institute of Medical Equipment Testing,Nanjing 210012) Abstract　Ordered mesoporous carbon-SiO2compound was prepared via co-assembly method, wherein resol was used as carbon precursor, tetraethyl orthosilicate was used as SiO2precursor, and triblock copolymer Pluronic F127 was used as template. Carbonization was carried out in a tubular furnace at 900℃for 3 h under N2flow and mesoporous carbon with secondary pore structure was obtained after removal of SiO2. The as-prepared sample was characterized by transmis-sion electron microscopy, nitrogen isotherm adsorption-desorption measurement, cyclic voltammetry and constant current charge-discharge. The results indicated that ordered mesoporous carbon possessed a high BET specific surface area of 1657·6m2·g-1and a specific capacitance of about 161·3F·g-1.The electrochemical performance was enhanced much more than the common mesoporous carbon material. Compared with the mesoporous carbon material with the single pore channel, the cyclic voltammetry curve of mesoporous carbon with secondary pore structure was closer to rectangular, the pecific capacitance value was greatly improved and the decreasing rate of the capacitance w