Ti/Ir0.4Sn0.6O2电极材料的电容性能

为了得到高比电容的电极材料,采用热分解法制备了不同温度下Ti/Ir0.4Sn0.6O2电极材料。运用X射线衍射(XRD)、差热分析、扫描电镜(SEM)和循环伏安法(CV)分别测试了该材料的晶体结构、表面形貌和电化学特性。结果表明:涂层的晶化温度高于360℃。320℃退火的电极表面有很多白色小颗粒析出,其活性氧化物较多。比电容受热处理影响较大,在280℃时电容值很小,可逆性低,320℃退火的电极比电容为454 F/g。该电极随着充放电循环次数的增加,比电容增加,经过9000次循环后,比电容才开始下降,经历10000次循环充放电后的比电容为493 F/g,比未经循环时还大10%。

Research on capacitive properties of Ti/Ir0.4Sn0.6O2 electrode material

In order to obtain a high specific capacitance,Ti/Ir0.4Sn0.6O2 electrodes were prepared by thermal decomposition.The structure,surface morphology and electrochemical properties of the Ti/Ir0.4Sn0.6O2 electrodes were investigated by X-ray diffraction(XRD),thermal analysis,scanning electron microscopy(SEM) and cyclic voltammetry(CV).The results show that the crystallization temperature of Ti/Ir0.4Sn0.6O2 electrode material is up to 360 ℃.Many small white particles on the electrode surface which are mainly composed of active oxide can be observed when it is annealed at 320 ℃.The specific capacitance is greatly affected by annealing temperature.The value of capacitance is small and its reversibility is very poor when the annealing temperature is 280 ℃.The maximum value of specific capacitance of the electrode annealed at 320 ℃ is 454 F/g.The specific capacitance increases as the charge-discharge cycle count is increased.After 9000 cycles,the specific capacitance just starts to decrease.Even after 10000 cycles,it is still maintained 10% higher than that of the first cycle and the value is 493 F/g.