Novel Solid Electrolyte CO Gas Sensors Based on -Axis-Oriented Y-Doped LaSiBO.

Nowadays, monitoring and recording CO gas has become more and more important in various areas, leading to increasing demand for developing high-sensitive CO sensors. In this study, a novel potentiometric CO gas sensor is designed based on a new solid electrolyte of Y-doped LaSiBO (Y-LSBO), coated with the LiCeO-Au-LiCO composite as a sensing electrode and Pt as a reference electrode. With the optimized composition of a sensing electrode, the electromotive force (EMF) varies linearly with the logarithm of the CO concentration in the range of 400-4000 ppm, exhibiting an excellent Nernstian response to CO gas in both dry and humid atmospheres. The fabricated CO sensor can be well operated at 400 °C in a dry atmosphere and 450 °C in a humid atmosphere. Based on the results, we have proposed that the good CO sensing performance may be associated with LiCeO playing a role of "ionic bridge" between the O conductor (Y-LSBO) and the Li conductor (LiCO). This study not only shows the promising potential of a Y-LSBO solid electrolyte utilized in the field of gas sensors but also enriches the research of solid electrolyte-based potentiometric CO gas sensors.