ATO包覆TiO2的导电性能研究

采用化学共沉淀法制备了Sb掺杂SnO_2包覆TiO_2的微纳米导电粉体。考察了不同Sb量对粉体的导电性能影响,通过XRD、SEM对粉体进行了表征。将导电粉体制成复合电极片,利用电化学工作站对其进行循环伏安和交流阻抗分析。结果表明,随着扫描速率的增加,氧化峰和还原峰分别向阴极和阳极移动,而且氧化还原峰的形状没有随着扫描速率的增加发生明显的变化;当m(SnCl_4·5H_2O)/m(SbCl_3)=10∶1时,容抗弧半径最小,且斜率最大,电阻最小,导电性最好。此结果与用电阻率测定仪测得电阻率的结果一致,说明利用交流阻抗法和循环伏安法考察导电粉体的导电性是可行的。

Study on Electrical Conductivity of TiO2 Coated by ATO

Micro-nano titanium dioxide conductive powder coated by antimony doped tin dioxide was prepared by the chemical co-precipitation method and characterized by XRD and SEM. The effect of the different antimony mass on the conductive properties of powder was examined. The results of cyclic voltammetry(CV) and alternating-current impedance diagrams curves analyzing on the composite electrode prepared by electrochemical workstation showed that with the increase of scanning speed, oxidation and reduction peaks moved to the cathode and anode, respectively, and the shape of th peaks didn''t change obviously; when the mass ratio of SnCl4?5H2O and SbCl3 was 10, capacitive reactance arc radius of the sample was the smallest and the slope was the largest, the resistance of the sample was minimum. The conductive performance of the powder sample prepared under the optimized condition was the best, which was in accordance with the results obtained by resistivity measurement using electrical resistivity device. So using AC impedance method and CV to investigate the conductivity of conductive powder was feasible.