Plasma‐Boosted Bi 2 Mn 4 O 10 Electrocatalysis Enables Real‐Time On‐Board Monitoring of CO 2 in Exhaust

ABSTRACT Real‐time monitoring of CO 2 concentration in automobile exhaust is critical for effective carbon emission reduction. However, the inherently inert nature of CO 2 poses a significant challenge for achieving accurate and efficient detection in the exhaust automobile environment. To overcome this, we introduce a groundbreaking smart CO 2 sensing technology based on gas discharge ionization. By leveraging nonthermal plasma (NTP), CO 2 is efficiently converted into highly reactive CO, which is subsequently detected by a high‐performance yttria‐stabilized zirconia (YSZ)‐based CO sensor. The sensor incorporates a Bi 2 Mn 4 O 10 sensing electrode (SE) and an Mn‐based reference electrode (RE), ensuring unparalleled selectivity and sensitivity for CO 2 monitoring in vehicle exhaust systems. Detailed analysis of Bi 2 Mn 4 O 10 highlights its strong electrochemical affinity for CO, which significantly boosts the sensor's durability and precision in detecting CO under dynamic conditions. This innovative fusion of NTP‐based CO 2 conversion and YSZ‐based CO detection results in a sensing system that excels in both robustness and accuracy, even in challenging environments. To further validate its potential, we developed a portable, real‐time CO 2 monitoring device, seamlessly integrating the NTP chamber with the electrochemical CO sensor. The device delivers exceptional detection performance and real‐time tracking capabilities, offering a highly promising solution for remote continuous monitoring of CO 2 emissions in vehicles.