亚微米K_(0.4)MoO_3电极材料的制备与电化学特性  

Preparation and Electrochemical Property of Submicron-Structured K_(0.4)MoO_3 Electrode Material

作　　者：代芳[1,2] 朱杨军 张志超[1,2] 廖钱生[1] 李平[2] 章磊[2] 温祖标[2] 

机构地区：[1]南昌工程学院江西省精密驱动与控制重点实验室,江西南昌330099 [2]江西师范大学化学化工学院,江西南昌330022

出　　处：《江西师范大学学报（自然科学版）》2017年第2期140-144,共5页Journal of Jiangxi Normal University(Natural Science Edition)

基　　金：国家自然科学基金(21463013);江西省自然科学基金(20142BAB203013)资助项目

摘　　要：以(NH_4)_6Mo_7O_(24)和K_2CO_3为反应物,采用高温固相法制备了系列K_xMoO_3(x=0.2、0.4、0.6、0.8)电极材料.分别采用X-射线衍射、扫描电子显微镜等对试样的晶型结构、形貌进行了表征;用循环伏安、恒流充放电和交流阻抗等电化学方法研究了材料的电化学性质.结果表明,在相同的扫描速率或电流密度下它们的比电容的大小关系为:K_(0.4)MoO_3>K_(0.8)MoO_3>K_(0.6)MoO_3>K0.2Mo O3,其中,K_(0.4)MoO_3在0.5 mol·L^(-1)K_2SO_4电解液中具有良好的倍率性能,且经600次循环充放电都表现出良好的循环稳定性.这意味着K_xMoO_3化合物可能是一种可选择的电化学电容器电极材料.The electrode materials of submicron-structured KxMoO3（x = 0.2,0.4,0.6,0.8） were synthesized by high temperature solid-state method using（NH4）6Mo7O24and K2CO3 as reactants.X-ray diffraction,scanning electron microscopy were used to investigate the crystal structure,morphology of the prepared materials,respectively.Their electrochemical properties were evaluated by cyclic voltammetry,galvanostatic charge-discharge and electrochemical impedance spectroscopy.The results showed that specific capacitance of KxMoO3 is in the order of K0.4MoO3〉 K0.8MoO3〉 K0.6MoO3〉 K0.2MoO3 at same scan rates or current density.Meanwhile,K0.4MoO3 electrode material exhibits excellent rate capability and super-cycling behavior of 600 charge-discharge cycles in 0.5 mol·L-1K2SO4 electrolyte,which maybe have a promising prospect for application in electrochemical capacitors.

关 键 词：电化学电容器 电极材料 电化学性能 K0.4MoO3 

分 类 号：TM53[电气工程—电器]