Abstract
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.
Highlights
According to the Statistical Review of World Energy, fossil fuels, i.e., coal, petroleum and natural gas, contribute about 85.5% primary energy for the world [1]
Results and Discussion between O2, CO2, and H2O with the oxygen concentration was fixed at 5% and H2O was induced by bubbling method. of replacing the frequently used Pt electrode with the LSCM, a zirconia-based
With the intention limiting current oxygen sensor comprises of LSCM electrodes will be fabricated
Summary
According to the Statistical Review of World Energy, fossil fuels, i.e., coal, petroleum and natural gas, contribute about 85.5% primary energy for the world [1]. Sustainable energy, such as solar power, is gradually coming into our world, the demand of fossil fuels still continuously grows every year owing to their high converting efficiency to energy [2]. When air/fuel (A/F) ratio is fixed at a stoichiometric point, e.g., A/F = 14.7 for gasoline, maximum energy conversion efficiency, and minimum exhaust gases emission are expected [3].
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