热处理及碳纳米管复合对δ-MnO_2超电容行为的影响  

Influences of heat treatment and CNT compounding on supercapacitive behaviors of δ-MnO_2

作　　者：王玉芹[1] 袁安保[1] 徐春燕[1] 饶薇薇[1] 

机构地区：[1]上海大学理学院化学系,上海200444

出　　处：《电源技术》2011年第11期1379-1383,共5页Chinese Journal of Power Sources

基　　金：上海高校选拔培养优秀青年教师科研专项基金(B.37-0101-09-009);上海市教育委员会重点学科建设项目(J50102)

摘　　要：以高锰酸钾(KMnO4)和硝酸锰[Mn(NO3)2]为反应物,通过液相氧化还原沉淀反应制备出纳米MnO2电极材料,并进行不同温度的热处理。此外,还用同样方法在碳纳米管(CNT)存在的条件下制备出经200℃热处理的纳米MnO2/CNT复合电极材料。采用X射线衍射(XRD)、红外光谱(IR)、透射电镜(TEM)和BET比表面面积测试方法对材料进行了表征,研究了热处理温度和CNT复合对纳米MnO2在1 mol/L LiOH电解质中电化学性能的影响。电化学研究结果表明,经200℃热处理的纳米MnO2具有较高的比电容,但循环稳定性不佳。经200℃热处理的含10%质量分数碳纳米管的纳米MnO2/CNT复合电极材料具有较好的循环稳定性和较高的比电容。Nanostructured MnO2 electrode materials were prepared by liquid-phase precipitation reaction starting with potassium permanganate（KMnO4） and manganese nitrate [Mn（NO3）2] reactants,followed by heat treatment at different temperatures.In addition,a nano-MnO2/carbon nanotube（CNT） composite electrode material was also prepared using the same method in the presence of CNT and heat treatment at 200 ℃.The materials were characterized by X-ray diffraction（XRD）,infrared spectroscopy（IR）,transmission electron microscope（TEM） and Brunauer-Emmett-Teller（BET） specific surface area measurement techniques.The influences of heat treatment and CNT compounding on electrochemical properties of the materials in 1 mol/L LiOH electrolyte were investigated.The nano-MnO2 heat treated at 200 ℃ exhibits a higher specific capacitance with poor cycling stability.However,good cycling stability as well as high specific capacitance is achieved for the nano-MnO2/CNT composite with 10% CNT and heat treatment at 200 ℃.

关 键 词：纳米MNO2 液相沉淀法 热处理 碳纳米管复合 LiOH电解质 电化学性能 

分 类 号：TM53[电气工程—电器]