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An application of (4YSZ)0.93(Fe2O3)0.07 in limiting current oxygen sensor
Xiangnan Wang1, Tao Liu2, Jingkun Yu1
1School of Metallurgy, Northeastern University, Shenyang, Liaoning, 110819, China.
Scientific Reports
|April 7, 2019
Summary
This study synthesized iron-doped zirconia (4YSZ-Fe2O3) and yttria-stabilized zirconia (9YSZ) for oxygen sensors. The developed sensor shows excellent performance, with limiting current linearly dependent on oxygen concentration and temperature, but not water vapor.
Area of Science:
- Materials Science
- Electrochemistry
- Sensor Technology
Background:
- Yttria-stabilized zirconia (YSZ) is a key material for solid electrolytes in oxygen sensors.
- Improving the performance and understanding the operational parameters of oxygen sensors are crucial for various industrial applications.
Purpose of the Study:
- To synthesize and characterize a novel iron-doped zirconia material, (4YSZ)0.93(Fe2O3)0.07, for use in oxygen sensors.
- To investigate the sensing characteristics of a limiting current oxygen sensor utilizing this material and 9YSZ solid electrolyte.
- To analyze the influence of temperature, oxygen concentration, and water vapor pressure on sensor performance.
Main Methods:
- Co-precipitation method for synthesizing (4YSZ)0.93(Fe2O3)0.07 and 9YSZ powders.
- Characterization of crystalline structure, microstructure, electronic conductivity, and total conductivity.
- Assembly of a limiting current oxygen sensor using a Pt sintered-paste method.
- Experimental investigation of sensor response under varying temperature, oxygen concentration, and water vapor pressure.
Main Results:
- Both (4YSZ)0.93(Fe2O3)0.07 and 9YSZ exhibit a cubic crystalline structure.
- (4YSZ)0.93(Fe2O3)0.07 demonstrates higher total conductivity than 9YSZ.
- The sensor exhibits excellent sensing characteristics, with limiting current (IL) showing a linear dependence on oxygen concentration (x(O2)) and a linear relationship between Log(IL·T) and inverse temperature (1000/T).
- Sensor response was found to be largely independent of water vapor pressure (pH2O).
Conclusions:
- The synthesized (4YSZ)0.93(Fe2O3)0.07 material possesses favorable electrical properties for oxygen sensing applications.
- The limiting current oxygen sensor demonstrates robust and predictable performance under varying environmental conditions.
- The findings provide valuable insights into the design and optimization of advanced oxygen sensing devices.
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