Oxygen separation using Bi2O3-based solid electrolytes

✍ Scribed by E.N. Naumovich; V.V. Kharton; V.V. Samokhval; A.V. Kovalevsky

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 784 KB
• Volume: 93
• Category: Article
• ISSN: 0167-2738
• DOI: 10.1016/s0167-2738(96)00488-2

✦ Synopsis

Electrical conductivity, oxygen ion transference numbers and thermal expansion of solid solutions Bi(Zr,Y)O,,, and Bi(Y,Pr)O, 5 have been investigated from the standpoint of their use for high temperature oxygen pumps. It has been found that use of solid electrolytes of ternary system Bi,O,-ZrO,-Y,O,, having high ionic conductivity, offers reduction in the polarization resistance of electrochemical cells with silver electrodes, as compared with electrolytes Bi(Y)O, 5. Formation of continuous series of solid solutions with mixed ionic and electronic conductivity has been ascertained for the system (Bi,_.XYXO, ,),_,(PrO , ,K33)r at x = 0.25-0.50 and y = O-O. 15. Oxygen ion transference numbers for the ceramics containing praseodimia are 0.85kO.10: Cermet electrodes containing silver and cobaltites Ln(Sr)CoO,_, (Ln is a rare earth element) possess much higher electrochemical activity than electrodes containing cobaltite only, and show better mechanical strength in comparison with silver electrodes.