Effect of sintering temperature on the electrolysis of TiO_2  

作　　者：Ze-quan Li Li-yue Ru Cheng-guang Bai Na Zhang Hai-hua Wang 

机构地区：[1]College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China [2]College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2012年第7期636-641,共6页矿物冶金与材料学报（英文版）

基　　金：financially supported by the Fundamental Research Funds for Central Universities in China (No. CDJXS11221172)

摘　　要：The effects of sintering temperature on the microstructure and the conductivity of TiO2 cathodes were studied by examining the phase composition, microstructure, and element contents of the sintered cathodes and the cathodic products using X-ray diffraction and scan- ning electronic microscopy-energy dispersive spectrometry. The oxygen vacancy, conductivity, average pore diameter, and specific surface area of the sintered cathodes were detected by X-ray photoelectron spectroscopy, four-point probe, and ASPA 2010. The results showed that TiO2 phase transformations occurred, and oxygen vacancies formed with the increase of sintering temperature. The cathodic conductivity improved, but the average pore diameter and the effective response area of the TiO2 cathode were reduced when the sintering temperature in- creased. These phenomena could weaken the contact between reaction ions and electrons and also had the same effect on the cathodes and the molten salt. Moreover, they were disadvantageous to ion migration, so a lower sintering temperature was favorable for the microstructure of electrolysis. Consequently, the cathodic conductivity may be improved, but the microstrucatre became compact with the increase of sin- tering temperature. The cathodic products at different temperatures indicated that the cathodic conductivity was more important for electroly- sis.The effects of sintering temperature on the microstructure and the conductivity of TiO2 cathodes were studied by examining the phase composition, microstructure, and element contents of the sintered cathodes and the cathodic products using X-ray diffraction and scan- ning electronic microscopy-energy dispersive spectrometry. The oxygen vacancy, conductivity, average pore diameter, and specific surface area of the sintered cathodes were detected by X-ray photoelectron spectroscopy, four-point probe, and ASPA 2010. The results showed that TiO2 phase transformations occurred, and oxygen vacancies formed with the increase of sintering temperature. The cathodic conductivity improved, but the average pore diameter and the effective response area of the TiO2 cathode were reduced when the sintering temperature in- creased. These phenomena could weaken the contact between reaction ions and electrons and also had the same effect on the cathodes and the molten salt. Moreover, they were disadvantageous to ion migration, so a lower sintering temperature was favorable for the microstructure of electrolysis. Consequently, the cathodic conductivity may be improved, but the microstrucatre became compact with the increase of sin- tering temperature. The cathodic products at different temperatures indicated that the cathodic conductivity was more important for electroly- sis.

关 键 词：titanium dioxidegelectrolysis SINTERING MICROSTRUCTURE 

分 类 号：TQ174.758[化学工程—陶瓷工业] TQ134.11[化学工程—硅酸盐工业]