Abstract

Here, we report a novel double perovskite-type BaCa0.33Nb0.34Fe0.33O3−δ (Fe–BCN) as a CO2 sensor at ppm level in a mixture of 21% O2 in N2 (dry synthetic air) working at 500–700°C. Powder X-ray diffraction (PXRD) was used to confirm the formation of cubic double perovskite-type structure. In situ PXRD measurement under CO2 showed excellent chemical stability in the temperature range of 25–800°C. A significant decrease in total impedance (resistance) was observed upon exposure to CO2 (ppm level) in synthetic air using AC impedance spectroscopy. Fe–BCN showed a fast response (t90∼4min) when 1500ppm CO2 was introduced. The sensor response was found to be linear over the investigated range in the logI vs. logpCO2. Fe-substitution in BaCa0.33Nb0.67O3 (BCN) is critical for the observed CO2 sensor properties since BCN exhibited a poor response under the identical sensor measurement conditions. The CO2 sensor mechanism was established using mass spectrometry (MS) in combination with DC measurements. The long-term sensor performance was studied for Fe–BCN and re-assured high sensitivity, stability and reliability.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.