空心海胆状MnO_2的低温水热制备及其电容性质  

Preparation and Capacitive Properties of MnO_2 Hollow Urchin by Low-Temperature Hydrothermal Method

作　　者：朱刚[1] 李江涛[1] 

机构地区：[1]西安文理学院化学与化学工程学院,西安710065

出　　处：《人工晶体学报》2015年第3期790-794,共5页Journal of Synthetic Crystals

基　　金：西安市科技计划项目(CXY1443WL28);陕西省教育厅项目(14JK2139);陕西省科技厅项目(2013K09-25)

摘　　要：在90℃条件下,水热处理KMn O4、(NH4)2SO4和H2SO4的水溶液24 h,制备得到了二氧化锰材料。应用X-射线衍射(XRD)、扫描电镜(SEM)和透射电镜(TEM)技术对所得材料的结构和形貌进行表征。结果表明,所得二氧化锰为具有空心海胆形貌的α-Mn O2。通过改变反应时间,研究了α-Mn O2的生成过程。同时,研究了空心海胆α-Mn O2的电容性质。循环伏安测试结果显示,当扫描速度为5 m V/s时,α-Mn O2的比电容为145 F/g。在20 m V/s的扫速下,循环2000圈后其比电容保持率高达95%。Manganese dioxide was prepared by hydrothermal treating a mixture solution of KMn O4,（ NH4）2SO4and H2SO4 at 90 ℃ for 24 h. The obtained material was characterized by X-ray diffraction,scanning electron microscopy and transmission electron microscopy. The results indicate that it is α-Mn O2 with hollow urchin morphology. The forming process of α-Mn O2 was investigated by varying the hydrothermal reaction time. Moreover, the capacitive properties of α-Mn O2 were tested. Cyclic voltammogram measurement results show that the specific capacitance is 145 F / g at a sweep rate of 5 m V / s.The specific capacitance retention reaches 95% after 2000 cycles at a sweep rate of 20 m V / s.

关 键 词：二氧化锰 空心海胆 电极材料 电容性质 

分 类 号：O614.711[理学—无机化学]