High-Performance Limiting Current Oxygen Sensor Comprised of Highly Active La(0.75)Sr(0.25)Cr(0.5)Mn(0.5)O₃ Electrode.
High-Performance Limiting Current Oxygen Sensor Comprised of Highly Active La(0.75)Sr(0.25)Cr(0.5)Mn(0.5)O₃ Electrode.
复制标题
高性能限制电流传感器由高度活性LA（0.75）SR（0.25）CR（0.5）MN（0.5）Mn（0.5）O₃电极组成。
DOI：
10.3390/s18072155
复制
发表时间：
2018-07-04
期刊：
影响因子：
--
通讯作者：
Jian J
中科院分区：
文献类型：
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作者：
Zou J;Lin Q;Cheng C;Zhang X;Jin Q;Jin H;Wang J;Jian J
氧化锆基极限电流氧传感器因其在提高化石燃料燃烧效率和减少废气排放方面的高性能而备受关注。然而，铂电极在氧传感器中的应用较多，成本较高，制约了其更广泛的应用。最近，La0.75Sr0.25Cr0.5Mn0.5O3(LSCM)被报道具有很高的催化氧还原活性。本文以取代常用的铂为目的，研究了将LSCM应用于氧化锆基极限电流氧传感器的可行性。通过比较LSCM和铂的电催化活性，证实了LSCM具有与铂相似的氧反应活性。然后，制作了由LSCM或铂组成的限流氧传感器，并评价了它们对2-25%范围内的氧的传感性能。总之，无论传感器中使用的是哪种敏感材料(LSCM或铂)，传感器的快速响应/恢复速率(在7s内)、线性关系和高选择性(相对于5%的CO2和H2O)都被观察到。特别是，由LSCM和铂组成的传感器的传感特性是相同的，这表明将LSCM电极应用于未来的氧化锆基氧气传感器是可行的。
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.