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采用水解沉淀法制备SnO_2·XH_2O电极材料。经过不同温度的焙烧,将得到的SnO_2·XH_2O电极材料用X射线粉末衍射(XRD),透射电子显微镜(TEM)和热失重测试(TGA)进行分析。XRD测试表明,SnO_2·XH_2O电极材料为金红石结构。TEM证实了SnO _2·XH_2O的形貌。TGA表明,随着焙烧温度的升高,SnO _2·XH_2O含水量降低。通过循环伏安法,恒流充放电和循环寿命研究了Sn _2·XH_2O的电化学行为。CV测试表明,在200℃下焙烧的SnO _2·XH_2O电极材料在5 mV/s,0.5 mol/L H_2SO4中的比电容为36.1 F/g。经过_2000次循环后,比电容与首次循环的比电容相比减少了2%。这些结果表明用化学沉淀法制备的Sn O_2·XH_2O是超级电容器良好的候选材料。
SnO_2 · XH_2O electrode material was prepared by hydrolytic precipitation method. After calcination at different temperatures, the obtained SnO_2 · XH_2O electrode materials were analyzed by X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and thermogravimetric analysis (TGA). XRD results show that the SnO_2 · XH_2O electrode material is rutile. TEM confirmed the morphology of SnO_2 · XH_2O. TGA showed that with the increase of calcination temperature, the water content of SnO_2 · XH_2O decreased. The electrochemical behavior of Sn_2 · XH_2O was studied by cyclic voltammetry, constant current charge-discharge and cycle life. The CV test showed that the specific capacitance of SnO_2 · XH_2O electrode material calcined at 200 ℃ was 36.1 F / g at 5 mV / s and 0.5 mol / L H2SO4. After ~ 2000 cycles, the specific capacitance is reduced by 2% compared to the specific capacitance of the first cycle. These results indicate that SnO_2 · XH_2O prepared by chemical precipitation is a good candidate material for supercapacitors.