Ce0.8Gd0.2O1.95 based Mixed Potential NH3 Sensors attached with CoMoO4/CoV2O6 Sensing Electrodes

Ammonia (NH 3 ) is an important industrial raw material as well as a typical environmental pollutant. Therefore, the rapid and precise monitoring of its concentration is essential for protecting human health and ensuring the sustainable functioning of ecosystems. In this study, CoMoO 4 /CoV 2 O 6 sensing electrode materials were synthesized via the sol-gel method, and a mixed potential type NH 3 sensor based on Ce 0.8 Gd 0.2 O 1.95 was successfully developed. By adjusting the amount of CoMoO 4 , the ion transport capability at the interface between the sensing electrode material and the solid electrolyte was significantly enhanced, which in turn improved the electrochemical reaction efficiency and sensitivity of the sensor. Among the fabricated sensors, the sensor using 10   mol% CoMoO 4 /CoV 2 O 6 as the sensing material demonstrated the highest response value of -103 mV to 100 ppm NH 3 at 500°C. This sensor not only exhibits high sensitivity but also possesses rapid response and recovery characteristics, excellent repeatability, selectivity, and long-term stability. The NH 3 sensor developed in this study shows significant potential for applications in industrial process monitoring, environmental monitoring, and related fields.