摘要
采用溶胶-凝胶技术,以Ti(OC4H9)4和Ce(NO3)3.6H2O为前驱体制备了Ti/Ce不同摩尔配比的TiO2-CeO2复合薄膜。运用X射线衍射(XRD)、扫描电镜(SEM)、紫外-可见光吸收光谱、循环伏安法和电化学交流阻抗等分析了其结构和性能。实验结果表明,当Ti/Ce摩尔比为1∶1时,薄膜具有致密的非晶态显微结构;在Li+离子注入/脱出过程中,薄膜有较快的电化学响应和较高的电荷容量,在20 mV.s-1的扫描速率下,注入Li+离子的扩散系数约为1.50×10-11cm2.s-1,并且第20次稳定循环的阴极和阳极电荷密度分别为12和9.5 mC.cm-2,表明薄膜具有良好的循环可逆性。电化学和光学测试表明该薄膜可以作为电致变色装置的对电极。
TiO2-CeO2 composite thin films were successfully prepared by the sol-gel process using Ti （OC4H9）4 and Ce（NO3）3·6H2O precursors with different Ti/Ce molar ratios. The structure and properties of the films were characterized by XRD, SEM, UV-VIS spectra, cyclic vohammetry measurements and electrochemical impedance spectra, respectively. The experimental results show that TiO2-CeO2 thin films with the molar ratio of 1 ： 1 have a compact and amorphous microstructure. During the process of Li^＋ intercalation/deintercalation, the films exhibit faster electrochemical response and higher charge capacity. The Li^＋ diffusion coefficient is 1.50 × 10^-11 cm^2·s^-1, and the cathodic and anodic charge densities for the 20th cycle at a scan velocity of 20 mV·s^-1 are about 12 and 9.5 mC·cm^-2, respectively and the reversibility is better. The electrochromical and optical measurements confirm that the films can be used as ion storage in electrochromic devices.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2007年第1期72-76,共5页
Chinese Journal of Rare Metals
基金
湖北省自然科学基金(2003ABA030)
湖北省铁电压电材料与器件重点实验室开放基金资助项目
