Oxygen-Vacancy-Channel CeO₂ Gas-Sensing Material

5-s detection of 20 ppb NO₂ at RT

Oxygen-vacancy channels bridge the bulk and surface to rapidly supply electrons, achieving record-fast room-temperature NO₂ sensing at low concentrations.

Yucheng, Ou · Fuwen, Wang · Liu, Tao · Wang, Bing · Zhang, Ming · Liao, Lei · Xu, Hui · Liu, Haijun · Li, Qingjiang · Wei-Wei, Wang

Advanced Science 2026

Specifications

Response time

{'zh': '5', 'en': '5'} s

Detection limit

{'zh': '20', 'en': '20'} ppb

Advantages

Electron transfer accelerated

Oxygen vacancy channels bridge bulk and surface, lowering migration barriers and allowing electrons to reach the surface quickly, overcoming polaron localization.

Adsorption and activation enhanced

Enhanced surface electron concentration and reaction activity at oxygen vacancy sites promote the adsorption and activation of O2 and NO2, improving sensing performance.

Fast detection at room temperature

Achieves a new benchmark: detection of 20 ppb NO2 in 5 s at room temperature, suitable for portable or low-power applications.

Applications

• NO₂ gas sensing：Use CeO2-based sensors to monitor NO2 levels rapidly at low temperatures.
• ppb-level hazardous gas detection：Detects 20 ppb NO2, enabling real-time warning for low-level hazardous gases.
• oxygen-vacancy-engineered catalytic materials：Exploit oxygen vacancy channels to enhance electron transport and surface catalytic activity.
• room-temperature flexible gas sensors：Room-temperature operation reduces power consumption, suitable for flexible wearable gas sensors.