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- Title
Reversible Room Temperature H 2 Gas Sensing Based on Self-Assembled Cobalt Oxysulfide.
- Authors
Zhou, Hui; Xu, Kai; Ha, Nam; Cheng, Yinfen; Ou, Rui; Ma, Qijie; Hu, Yihong; Trinh, Vien; Ren, Guanghui; Li, Zhong; Ou, Jian Zhen
- Abstract
Reversible H2 gas sensing at room temperature has been highly desirable given the booming of the Internet of Things (IoT), zero-emission vehicles, and fuel cell technologies. Conventional metal oxide-based semiconducting gas sensors have been considered as suitable candidates given their low-cost, high sensitivity, and long stability. However, the dominant sensing mechanism is based on the chemisorption of gas molecules which requires elevated temperatures to activate the catalytic reaction of target gas molecules with chemisorbed O, leaving the drawbacks of high-power consumption and poor selectivity. In this work, we introduce an alternative candidate of cobalt oxysulfide derived from the calcination of self-assembled cobalt sulfide micro-cages. It is found that the majority of S atoms are replaced by O in cobalt oxysulfide, transforming the crystal structure to tetragonal coordination and slightly expanding the optical bandgap energy. The H2 gas sensing performances of cobalt oxysulfide are fully reversible at room temperature, demonstrating peculiar p-type gas responses with a magnitude of 15% for 1% H2 and a high degree of selectivity over CH4, NO2, and CO2. Such excellent performances are possibly ascribed to the physisorption dominating the gas–matter interaction. This work demonstrates the great potentials of transition metal oxysulfide compounds for room-temperature fully reversible gas sensing.
- Subjects
COBALT; COBALT sulfide; TRANSITION metal compounds; FUEL cells; GAS detectors; HIGH temperatures; ZERO emissions vehicles
- Publication
Sensors (14248220), 2022, Vol 22, Issue 1, p303
- ISSN
1424-8220
- Publication type
Article
- DOI
10.3390/s22010303