A room-temperature MEMS hydrogen sensor for lithium ion battery gas detecting based on Pt-modified Nb doped TiO2 nanosheets.

Early detecting of the released gas during charging and discharging of lithium ion battery (LIB) is critical for safety monitoring of the equipment and devices which use LIB as power source. H 2 is one of the typical component of the released gas. The main challenges for detecting H 2 in LIB is the room temperature working, small size of the sensor and hypoxic environment. To address these problems, a room temperature working MEMS hydrogen sensor was developed with Pt-modified Nb-doped TiO 2 nanosheet as sensing material. The sensor has the advantages of a compact size (0.05 cm3), low power consumption (0.1 mW at room temperature), easy integration, and excellent sensing performance. The response achieved 12.3, and the response and recovery time are 31 s/270 s at room temperature to 1000 ppm H 2 (40 °C). The working mechanism of the sensor in the hypoxic environment, which is quite different from the traditional oxygen adsorption mechanism, is proposed according to the characterization of the MEMS sensors. [Display omitted] • The sensor with volume (0.05 cm3) and power consumption (0.1 mW at room temperature) have greatly the potential applications. • MEMS H 2 sensor shows high sensitivity to hydrogen at room temperature (S = 12.3–1000 ppm H 2). • Clarifies the mechanism of sensing mechanism in hypoxic environment. • The sensor shows excellent selectivity and long-term stability for 100 days. [ABSTRACT FROM AUTHOR]