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Reversible Room Temperature $H_{2}$ Gas Sensing Based on Self-Assembled Cobalt Oxysulfide
| Content Provider | MDPI |
|---|---|
| Author | Zhou, Hui Xu, Kai Ha, Nam Cheng, Yinfen Ou, Rui Ma, Qijie Hu, Yihong Trinh, Vien Ren, Guanghui Li, Zhong Ou, Jian Zhen |
| Copyright Year | 2021 |
| Description | Reversible $H_{2}$ 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 $H_{2}$ 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% $H_{2}$ and a high degree of selectivity over $CH_{4}$, $NO_{2}$, and $CO_{2}$. 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. |
| Starting Page | 303 |
| e-ISSN | 14248220 |
| DOI | 10.3390/s22010303 |
| Journal | Sensors |
| Issue Number | 1 |
| Volume Number | 22 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-12-31 |
| Access Restriction | Open |
| Subject Keyword | Sensors Industrial Engineering Cobalt Oxysulfide H2 Sensor Physisorption Room-temperature Gas Sensing |
| Content Type | Text |
| Resource Type | Article |
