摘要
采用水热法制备了超级电容器用MnO2纳米棒。运用SEM、XRD和N2吸附对实验制备的MnO2进行了形貌和结构分析。通过循环伏安和恒流充放电测试研究了MnO2的电化学性能。结果表明,实验制备的MnO2纳米棒为α型结构,直径为50~70nm,比表面积为105.2m2/g。在-0.5~0.4V(vs.SCE)的电位范围内表现出典型的赝电容行为和良好的功率特性,电流密度为10mA/cm2时,其比容达到413F/g。
MnO2 nanorods for supercapacitors were prepared by hydrothermal synthesis method. The samples were analyzed by scanning electron microscopy (SEM), N2 adsorption and X -ray diffraction (XRD). Cyclic vohammetry and galvanostatic charge -discharge were used to characterize the electrochemical performance of the samples. The results showed that the prepared samples were α - MnO2 with a BET specific surface area of 105.2m2/g. The particles were in a rod shape with a diameter of 50 to 70nm. In an electrolyte of lmol/L (NH4)2SO4, electrode based on the MnO2 showed perfect pseudoca- paeitive and power characterization in the potential region of -0.5 -0.4V( vs. SCE). At a current density of 10mA/em2, a specific capacitance of 413F/g was achieved.
出处
《功能材料与器件学报》
CAS
CSCD
北大核心
2009年第5期503-506,共4页
Journal of Functional Materials and Devices
基金
江西省自然科学基金(0650028)
江西省教育厅科技基金(赣教技字[2007]276号)
关键词
水热法
MNO2
超级电容器
比容
hydrothermal synthesis, MnO2, supercapacitors, specific capacitance