Sn掺杂二氧化锰超级电容器电极材料  

Sn Doped MnO_2 Electrode Material for Supercapacitors

作　　者：庞旭[1] 马正青[1] 左列[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083

出　　处：《物理化学学报》2009年第12期2433-2437,共5页Acta Physico-Chimica Sinica

摘　　要：用化学液相法制备了超级电容器用的Sn掺杂二氧化锰电极材料.采用扫描电镜(SEM)、能谱仪(EDS)和X射线衍射(XRD)光谱对电极材料的形貌和物相进行表征.结果表明,所得样品由直径约10nm,长约100nm的棒状物粘结成200-500nm的球状物,晶型为δ-MnO2.循环伏安、电化学交流阻抗和恒流充放电测试表明,化学掺杂的比例对材料的电化学性能有较大的影响.当Mn∶Sn的摩尔比为50∶1时,电极材料的比电容达到293F·g-1,比未掺杂的提高了64.6%.600次充放电循环后,比电容稳定在275F·g-1,表现出良好的容量保持能力.Tin doped MnO2 was synthesized by chemical co-precipitation method to be used as an electrode material for supercapacitors.The morphology and structure of the products were characterized by scanning electron microscopy（SEM）,energy dispersive spectrometer（EDS）,and X-ray diffraction（XRD） spectrometry.Results showed that the products were made up of 200-500 nm spherical particles formed with 10 nm（diameter） by 100 nm（length） nanorods.And the crystallographic structure of MnO2 was the poorly crystallized δ-type.Cyclic voltammetry（CV）,electrochemical impedance spectrometry（EIS）,and galvanostatic charge-discharge tests indicated that the ratio of tin in the products had great effect on the electrochemical capacity.A specific capacitance of 293 F·g^-1 was obtained when the molar ratio of Mn to Sn was 50∶1,which was 64.6% higher than that of the undoped material.After 600 chargedischarge cycles,the specific capacitance stabilized at 275 F·g^-1,exhibiting favorable capacitance retention ability.

关 键 词：超级电容器 二氧化锰 掺杂 二氧化锡 电极材料 

分 类 号：TM53[电气工程—电器]