Study of YSZ Amperometric Oxygen Sensor with a Dense Barrier Layer

Abstract:

A new type of amperometric oxygen sensor was developed by an approach of co-pressing and co-sintering YSZ solid electrolyte. A dense LSM+YSZ composite electrode which was used as both cathode and diffusion barrier. Pre-sintered composite and YSZ powders were dry-pressed together to form a sheet with dual-layer of LSM+YSZ/YSZ. The sheet was then sintered at 1450°C. The anode was made of Pt paste, which was printed on to the other side of YSZ. The experiment results showed that the oxygen sensor exhibited a quite low operating temperature. At 400°C, the limiting current appeared in the voltage from 0.7 to 1.2V and the limiting current was a good linear relationship with the oxygen concentration up to 10 %. The sensor has some excellent features such as a rapid response, no reference gas, simple configuration and low cost. Taken together with the chemical stability of the diffusion barrier, the sensor is suitable for the control of air-to-fuel ratio in lean-burn internal combustion engines.

• Periodical: Key Engineering Materials (Volumes 280-283)
• Pages: 431-434
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.280-283.431
• Online since: February 2007
• Authors: Xing Shi, Yue Zhang
• Keywords: Amperometric Oxygen Sensor, Mixed Conductor, YSZ

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