有序介孔碳负载NiCo2O4电极的制备及其超电容性能.PDFVIP

有序介孔碳负载NiCo2O4电极的制备及其超电容性能 车 倩 张 方 张校刚* 卢向军 丁 兵 朱佳佳 (南京航空航天大学材料科学与技术学院,南京 210016) 摘要: 以有序介孔碳(OMC)为载体,采用共沉淀法制备了OMC/NiCo2O4复合物.用X射线衍射(XRD)、傅里叶 变换红外(FT-IR)光谱和透射电镜(TEM)研究其结构与形貌,发现NiCo2O4纳米颗粒均匀地负载在有序介孔碳 上.循环伏安和恒流充放电测试表明, NiCo2O4质量分数为40%时,在1 A·g-1的电流密度下,复合物电极的比电 容可以达到577.0 F·g-1,电流密度为8 A·g-1时,比电容可以达到470.8 F·g-1,并具有良好的循环稳定性.在2 A·g-1的电流密度下,经过2000次循环后,比电容还可达到508.4 F·g-1,电容保持率为92.7%. 关键词: 超级电容器; 有序介孔碳; NiCo2O4; 共沉淀法 中图分类号: O646 Preparation of Ordered Mesoporous Carbon/NiCo2O4 Electrode and Its Electrochemical Capacitive Behavior CHE Qian ZHANG Fang ZHANG Xiao-Gang* LU Xiang-Jun DING Bing ZHU Jia-Jia (College of Material Science Engneering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P. R. China) Abstract: OMC/NiCo2O4 composite was prepared by co-precipitation with ordered mesoporous carbon (OMC) as a support. The crystalline structure and morphology of the composite were investigated by X-ray diffraction (XRD), Fourier-transform infrared (FT-IR) spectroscopy, and transmission electron microscopy (TEM). TEM images showed that NiCo2O4 was uniformly coated on the OMC. Cyclic voltammetry and galvanostatic charge-discharge were used to investigate the electrochemical performance of the OMC/ NiCo2O4 composite. The specific capacitances of the OMC/NiCo2O4 composite with a mass fraction of 40% NiCo2O4 were 577.0 F·g-1 at a current density of 1 A·g-1 and 470.8 F·g-1 at 8 A·g-1. The specific capacitance remains at 508.4 F·g-1 after 2000 cycles at a current density of 2 A·g-1, with a capacitance retention of 92.7%. Key Words: Supercapacitor; Ordered mesoporous carbon; NiCo2O4; Co-precipitation method [Article] 物理化学学报(Wuli Huaxue Xuebao) Acta Phys. -Chim. Sin. 2012, 28 (4), 837-842April Received: October 31, 2011; Revised: February 1, 2012; Published on Web: February 7, 2012. ?Corresponding author. Email: azhangxg@163.com; Tel: +86-25 Fax: +86-25 The project was supported by the National Natural Science Foundation of China , Natural