Low platinum catalyst supported on titanium molybdenum nitride for efficient CO sensing
Sensors and Actuators B: Chemical(2022)
Abstract
Gas sensing catalyst is the key to proton exchange membrane fuel cell type gas sensor. However, due to the limitations of Pt/C catalyst in an electronic structure and electrochemical stability, the sensing performance of the sensor inconformity the strict performance objectives, and new sensing materials are required. Here we demonstrate that a novel sensing catalyst, Pt/Ti0.8Mo0.2N, is a highly efficient CO sensing that outperforms the benchmark material Pt/TiN and Pt/C. Pt/Ti0.8Mo0.2N effectively reduces the cross-sensitivity of interfering gas and greatly improves the CO selectivity, sensitivity and long-term stability of the sensor. Simultaneously, profit by the design of a high humidity cathode sealing chamber, the relative humidity of the environment exhibits a slight impact on the sensor. Furthermore, we confirm that Pt/Ti0.8Mo0.2N exhibit the best gas sensing performance at low Pt loading of 15 wt%. This discovery points to the strategy of combining low-cost and high-performance electrode catalytic materials for new generation gas sensors.
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Key words
CO,Pt/Ti0.8Mo0.2N,Low Pt content,Gas sensors
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