Plate-like Cr2O3 for highly selective sensing of nitric oxide

Selective sensing of nitric oxide (NO) in exhaust for so far reported exhaust gas sensors, particularly, without any interference from the coexist hydrocarbons (e.g., C 3 H 6 ) is still a challengeable issue. In this research, Cr 2 O 3 with various microstructures were successfully synthesized via hydrothermal route and used as sensing-electrodes (SEs) for detection of NO at high temperatures. Surprisingly, Cr 2 O 3 with plate-like microstructure demonstrated high selectivity towards NO against C 3 H 6 . In addition, the sensing performance of the plate-like Cr 2 O 3 towards NO was found to be unaffected by the change of oxygen concentration at 475   °C.