Ce掺杂Mn3O4及其电化学电容行为  

Ce-Doped Mn_3O_4 and Its Electrochemical Capacitive Behavior

作　　者：张子瑜[1] 胡中爱[1] 杨玉英[1] 王欢文[1] 常艳琴[1] 陈艳丽[1] 雷自强[1] 

机构地区：[1]西北师范大学化学化工学院,甘肃省高分子材料重点实验室,生态环境相关高分子材料教育部重点实验室,兰州730070

出　　处：《物理化学学报》2011年第7期1673-1678,共6页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(20963009);甘肃省自然科学基金(0803RJ2A005);甘肃省教育厅研究生导师计划项目资助~~

摘　　要：用溶胶-凝胶方法合成了Mn_3O_4和Ce掺杂Mn_3O_4.采用X射线衍射(XRD)、傅里叶变换红外(FT-IR)光谱、场发射扫描电镜(FESEM)和透射电子显微镜(TEM)对其结构和形貌进行了表征.采用循环伏安、电化学交流阻抗和恒流充放电技术对其电化学性能进行了测试.研究结果表明,Ce掺杂对Mn_3O_4的形貌和电化学性能均有显著影响.当Ce离子占金属离子总量的3%时,掺杂Mn_3O_4的单电极比电容高达477 F·g^(-1),比未掺杂的提高了43.7%,并且表现出更好的循环稳定性.Mn3O4 and Ce doped Mn3O4 were synthesized via a sol-gel route using metal nitrates as raw materials and citric acid as the chelating agent. The gel precursors were calcined at 300℃ for 12 h in a muffle furnace. Their morphology and structure were characterized using powder X-ray diffraction （XRD）, Fourier transform infrared （FT-IR） spectroscopy, field emission scanning electron microscopy （FESEM）, and transmission electron microscopy （TEM）. Their electrochemical performance as a supercapacitor electrode material was investigated comparatively by cyclic voltammetry （CV）, electrochemical impedance spectroscopy （EIS）, and galvanostatic charge-discharge. The experimental results indicated that Ce- doping did not change the structure of Mn3O4 but greatly affected the morphology and considerably enhanced the electrochemical performance of Mn3O4. A specific capacitance of 477 F· g^-1 was obtained when the mole ratio of Ce ion to total metal ions was 3%, which was 43.7% higher than that of the undoped material. Moreover, Ce-doping significantly improved the capacitance retention ability.

关 键 词：溶胶-凝胶 MN3O4 CE 掺杂 电化学电容 

分 类 号：TM53[电气工程—电器]