添加剂对水热合成MnO_2电化学性能的影响  

Effect of additive doping on electrochemical performance of hydrothermal prepared MnO_2

作　　者：陈野[1] 张巍[1] 张尊波 

机构地区：[1]哈尔滨工程大学材料科学与化学工程学院,黑龙江哈尔滨150001 [2]哈尔滨巨容新能源有限公司,黑龙江哈尔滨150078

出　　处：《电源技术》2009年第8期671-675,共5页Chinese Journal of Power Sources

基　　金：教育部博士点基金资助(20050217019)

摘　　要：用异丙醇作为添加剂,采用水热法,在添加1mL异丙醇的水溶液中制备了MnO2,并与在纯水中制备的MnO2进行比较,通过X射线衍射(XRD)、扫描电镜(SEM)对样品的结构、形貌进行了表征,结果显示,在异丙醇水溶液中合成的样品具有更高的结晶程度,为α-MnO2和γ-MnO2的混合相,添加异丙醇后改善了样品的微观颗粒形貌,提高了颗粒的分散度。电化学测试表明,添加异丙醇后样品的电化学性能得到明显改善,具有更好的循环伏安性能和更小的电化学阻抗,其在2mA/cm2电流密度下放电比电容达到289.56F/g。MnO2 was prepared with 1 mL isopropanol doped by hydrothermal method, and properties of MnO2 were compared with that prepared without additive. XRD, SEM analysis indicates that MnO2 prepared with 1 mL isopropanol doped comparing with the one synthesized without additive exhibit higher crystallization degree and the composition of the sample is α-MnO2 and γ-MnO2. MnO2 with additive droped shows morphology of the particles improves and decentralization enhances. Resultes of electrochemical tests show that supercapacitor performance of MnO2 with additive doped improved greatly. Isopropanol added attributed to better cycle performance and lower electrochemical impedance. Results of constant current charge/discharge show that the specific capacitance reaches 289.56 F/g at 2 mA/cm2.

关 键 词：MNO2 超级电容器 水热合成 超级电容性能 

分 类 号：TM53[电气工程—电器]