Abstract
A novel ceria-based amperometric NO x and NH3 sensor was investigated. The sensor consisted of gadolinium-doped ceria electrolyte membrane with (La0.60Sr0.40) (Co0.20Fe0.80) $\text{O}_{3-\delta }$ (LSCF) electrodes applied to opposite sides. The assembly operated in combustion exhaust streams with higher sensitivity to both NO x and NH3, less dependence on oxygen partial pressure, and faster response than previously reported. The sensor had an operational temperature range of 200 °C–550 °C and was resistant to common exhaust gas contaminants, such as steam, CO2, and sulfur oxides. Electrochemical testing and in-situ DRIFTS studies showed NO x adsorption on the sensor causing accelerated kinetics for oxygen reduction reaction (ORR) whereby adsorbed NO x species acted as a catalyst for an alternative ORR pathway, thus enabling an amperometric sensing mechanism.
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