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Open AccessArticle

High-Performance Limiting Current Oxygen Sensor Comprised of Highly Active La0.75Sr0.25Cr0.5Mn0.5O3 Electrode

1
Environmental Monitor & Sensing Technology Laboratory, School of Electrical Engineering and Computer Science, Ningbo University, Ningbo 315211, China
2
State Key Laboratory of Transducer Technology, Chinese Academy of Sciences, Shanghai 200050, China
3
Ningbo Materials Science and Technology Institute, Chinese Academy of Sciences, Ningbo 315201, China
4
School of Electronic and Information Engineering, Ningbo University of Technology, Ningbo 315211, China
*
Authors to whom correspondence should be addressed.
Sensors 2018, 18(7), 2155; https://doi.org/10.3390/s18072155
Received: 7 June 2018 / Revised: 30 June 2018 / Accepted: 2 July 2018 / Published: 4 July 2018
(This article belongs to the Special Issue Functional Materials for the Applications of Advanced Gas Sensors)
Zirconia-based limiting current oxygen sensor gains considerable attention, due to its high-performance in improving the combustion efficiency of fossil fuels and reducing the emission of exhaust gases. Nevertheless, the Pt electrode is frequently used in the oxygen sensor, therefore, it restrains the broader application due to the high cost. Quite recently, La0.75Sr0.25Cr0.5Mn0.5O3 (LSCM) has been reported to be highly active to catalyze oxygen reduction. Herein, with the intention of replacing the frequently used Pt, we studied the practicability of adapting the LSCM to zirconia-based limiting current oxygen sensor. Through comparing the electrocatalytic activity of LSCM and Pt, it is confirmed that LSCM gave analogous oxygen reactivity with that of the Pt. Then, limiting the current oxygen sensors comprised of LSCM or Pt are fabricated and their sensing behavior to oxygen in the range of 2–25% is evaluated. Conclusively, quick response/recovery rate (within 7s), linear relationship, and high selectivity (against 5% CO2 and H2O) in sensing oxygen are observed for the sensors, regardless of the sensing materials (LSCM or Pt) that are used in the sensor. Particularly, identical sensing characteristics are observed for the sensors consisting of LSCM or Pt, indicating the practicability of replacing the Pt electrode by adapting the LSCM electrode to future zirconia-based oxygen sensors. View Full-Text
Keywords: limiting current oxygen sensor; zirconia-based; perovskite crystal phase limiting current oxygen sensor; zirconia-based; perovskite crystal phase
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Zou, J.; Lin, Q.; Cheng, C.; Zhang, X.; Jin, Q.; Jin, H.; Wang, J.; Jian, J. High-Performance Limiting Current Oxygen Sensor Comprised of Highly Active La0.75Sr0.25Cr0.5Mn0.5O3 Electrode. Sensors 2018, 18, 2155.

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