超级电容器用MnO_2纳米棒的水热法合成和表征

Hydrothermal synthesis and characterization of MnO_2 nanorods for supercapacitor

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.