【摘要】 通过水热法以硫酸钛为钛源制备TiO₂纳米颗粒,然后将样品制成电极模拟超级电容器.1)通过SEM观察TiO₂纳米颗粒的微观形貌,其直径大小分布在30⁵0nm,并通过XRD测定TiO₂纳米颗粒的晶相结构为锐钛矿型;2)对超级电容器进行电循环处理,其比电容从10mF/cm2增长到103mF/cm2,并达到稳定,说明电循环处理大幅度提高了该样品的电导率;3)CV曲线中观察到一对明显的氧化还原峰,其比电容主要起源于该氧化还原反应.恒流充放电和CV曲线计算所得比电容基本一致,阻抗谱图谱也清晰地显示了氧化还原反应所对应的极化电阻的存在.更多还原

【Abstract】 In this paper work,TiO₂ nanoparticles were prepared by hydrothermal method using titanium sulfate as titanium source,and then the samples were made into electrode simulation supercapacitors.1)The microstructure of TiO₂ nanoparticles was observed by SEM,and the diameter of TiO₂ nanoparticles was 30⁵0nm.The crystal structure of TiO₂ nanoparticles was anatase confirmed by XRD;2)the supercapacitor is subjected to an electrical cycle process with an increase of specific capacitance from 10mF/cm2 to a stable value of 103mF/cm2,which suggests that the conductivity of the sample was significantly improved by the electric cycle treatment;3)apair of obvious redox peaks was observed in the CV curve,and the specific capacitance of supercapacitor mainly originate from the corresponding redox reaction.The specific capacitance values are in agreement with each other,calculated by CV curve and the constant current charge/discharge curve,respectively.In addition,the polarization resistance due to Redox reaction was demonstrated by the measured impedance spectra for the fabricated nanoparticle supercapacitor.更多还原