溶胶-凝胶法制备掺镧改性纳米MnO_2  

Preparation of La-doped nano MnO_2 by sol-gel method

作　　者：赵娜英 卞洁鹏 杨雪健 杨庆浩[1] Zhao Naying;Bian Jiepeng;Yang Xuejian;Yang Qinghao(College of Materials Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054;College of Safety Science and Engineering,Xi^n University of Science and Technology,Xi'an 710054)

机构地区：[1]西安科技大学材料科学与工程学院,西安710054 [2]西安科技大学安全科学与工程学院,西安710054

出　　处：《化工新型材料》2019年第5期164-166,171,共4页New Chemical Materials

基　　金：国家自然科学基金(21204072);陕西省重点科技创新团队计划(2014KCT-04)

摘　　要：采用溶胶-凝胶法制备出掺镧纳米MnO_2活性电极材料,分别研究了酸处理、温度及硝酸镧含量对掺镧纳米MnO_2的形貌与性能的影响。结果表明:酸化与掺镧是有效提升纳米MnO_2电化学活性的手段,酸化可以减小颗粒尺度,提高松散程度,掺镧可以优化纳米MnO_2晶型结构,提升比电容;在焙烧温度为300℃,硝酸镧和乙酸锰的摩尔比为0.09∶1时,制备的纳米MnO_2电极材料的比电容最大,且充放电过程一致性较好。La-doped nano manganese dioxide active electrode material was prepared by sol-gel method.The effects of acid treatment,temperature and lanthanum nitrate content on the morphology and properties of nano-MnO2 were studied respectively.The results showed that acidification and lanthanum doping were effective means to improve the electrochemical activity of nano-MnO2,acidification can reduce the particle size and improved the loose degree.Doping can optimize the crystal structure and enhanced the specific capacitance for nano-MnO2.When the calcination temperature was 300℃,the molar ratio of lanthanum nitrate and acetic acid manganese was 0.09∶1,the specific capacitance of electrode material reached the maximum,and the charge discharge process had good consistency.

关 键 词：MNO2 溶胶-凝胶法 掺镧改性 比电容 

分 类 号：TM53[电气工程—电器] TQ137.12[化学工程—无机化工]