IrO2-SnO2涂层电极材料的电容性能研究

通过热分解法在Ti基体上制备了不同Sn含量的IrO2-SnO2涂层。采用循环伏安(CV),恒流充放电和透射电镜(TEM)等测试方法分析了涂层的电容性能和组织结构的关系。结果表明,所制备的IrO2-SnO2涂层电极的比电容随Sn含量的增加呈先增后减的变化,电极材料的可逆性和快速充放电性能逐渐得到改善。在Sn含量为70mol%时,有最大的比电容值485.07F/g。该涂层以非晶态结构为主,其中含有尺寸分布均匀,大小约1nm的微晶,增大了活性点的面积,比纯IrO2电极的比电容提高了7.5倍。

Research on Capacitance Properties of IrO2-SnO2 Coating Electrode Materials

IrO2-SnO2 coatings with different Sn contents were prepared on titanium substrate by a thermal decomposition method. The relationship between the capacitance properties and microstructure was investigated by means of cyclic voltammetry, constant current discharge measurements and transmission electron microscope (TEM). Results show that the specific capacitance of IrO2-SnO2 coating electrodes increases first and then decreases with the Sn content increasing. The reversibilities and fast charging and discharging behaviors of the electrode materials are improved gradually. The maximal specific capacitance reaches 485.07 F/g when the content of Sn is 70 mol%, 7.5 times larger than that of pure IrO2 electrode. The coating is of amorphous structure, including the nanocrystalline with about 1 nm size and narrow size distribution, which increases the active site area.