A CO2 Sensor Based on a Trivalent Ion Conducting Sc1/3Zr2(PO4)3 Solid Electrolyte

On-site monitoring and control of CO2 emissions are required in order to effectively combat global warming. For this, mechanically and chemically stable compact sensors that are highly sensitive to CO2 but insensitive to other gas species are desirable. In this article, a compact CO2 sensor based on Sc1/3Zr2(PO4)3 and yttria-stabilized zirconia solid electrolytes is reported that not only shows a high sensitivity but also a high selectivity for CO2, with a rapid and reproducible response. Coupled with its high mechanical strength and chemical stability, this sensor promises to be useful under a wide variety of conditions.