Plate-like Cr2O3 for highly selective sensing of nitric oxide

• In comparison with irregular shape and cubic-like Cr2O3, plate-like Cr2O3 demonstrated high selectivity towards nitric oxide (NO) without any interference from the coexist hydrocarbons.
• The sensing behavior of the plate-like Cr2O3 was found to be unaffected by different oxygen concentrations in the range of 5–21 vol.%.
• By utilizing plate-like Cr2O3 sensing-electrode and newly reported manganese-based reference-electrode, a miniaturized highly selective zirconia-based NO sensor was developed.

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., C3H6) is still a challengeable issue. In this research, Cr2O3 with various microstructures were successfully synthesized via hydrothermal route and used as sensing-electrodes (SEs) for detection of NO at high temperatures. Surprisingly, Cr2O3 with plate-like microstructure demonstrated high selectivity towards NO against C3H6. In addition, the sensing performance of the plate-like Cr2O3 towards NO was found to be unaffected by the change of oxygen concentration at 475 °C.

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