Ag/TiO_2导电粉体的制备及电化学性能研究

Preparation and electrochemical properties of the conductive Ag/TiO_2 powder

采用湿化学方法,以Ti O_2为基质,制备了Ag/Ti O_2复合导电粉体.考察了Ag NO3和Ti O_2不同配比时产品对导电性能的影响,用SEM、XRD对粉体进行了表征.将粉体制成复合电极,对其进行了电化学性能分析.结果表明,nAg与nTi O_2配比不同,产品容抗弧半径相差较大.当nAg:nTi O_2>1:3时,高频区容抗弧半径逐渐减小,且曲线与横轴的交点值最小,同时低频区斜率较大,说明当nAg与nTi O_2配比越高,导电性能越好.上述结果表明,当Ti O_2基质表面涂覆较为均为致密的Ag纳米粒子后,Ti O_2表面形成完整的导电网络结构,导电性较好.此结果与用电阻率测定仪测得电阻率的结果一致.

Ag/TiO2 composite conductive powder was prepared using wet chemical method applied TiO 2 as substrate.The effect of different molar ratio of TiO 2 and AgNO3 on conductivity was researched in this paper , and the products were characterized by SEM and XRD .To analyzing its electrochemical performance , the composite electrodes were made .The results showed that the products capacitive arc radius altered with the molar ratio of TiO2 and AgNO3.When its ratio of Ag and TiO2 surpassed over 1：3, high-frequency capacitive arc radius grad-ually reduced while the intersection value of the curve with the horizontal axis small and the low -frequency re-gion slope larger .That indicated that the molar ratio of Ag and TiO 2 was higher , the better the conductive proper-ties was.The above results show that when the surface of the TiO 2 substrate is coated with Ag particles more dense, a complete conductive network structure is formed on the TiO 2 surface, and the conductivity was better . The result was consistent with the value measured with a Resistivity Meter .