期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 423, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.127193
关键词
Solid-solid separation method; Ti0.5Cr0.5N; Room-temperature; Fuel cell gas sensor; Hydrogen sulfide
资金
- National Natural Science Foundation of China [61971405]
- National Key Research and Development Plan [2016YFB0101205]
- Zhejiang Provincial Science Foundation for Distinguished Young Scholars of China [R20B010002]
- China Postdoctoral Science Foundation [2021M693252]
- Science and Technology Foundation of Ningbo, China [2018b10056, 2019C50010]
- State Key Laboratory of ASIC System, China [2020KF002]
- National Thousand Youth Talents Program of China
In fuel cell gas sensors, Pt/Ti0.5Cr0.5N-based sensors demonstrate high electrochemical stability and strong metal-support interactions, resulting in significantly reduced response to H2S. They also show negligible cross response to other interfering gases, confirming their excellent long-term stability and selectivity.
Efficient, accurate and reliable detection and monitoring of H2S is of significance in a wide range of areas: industrial production, medical diagnosis, environmental monitoring, and health screening. However the rapid corrosion of commercial platinum-on-carbon (Pt/C) sensing electrodes in the presence of H2S presents a fundamental challenge for fuel cell gas sensors. Herein we report a solution to the issue through the design of a sensing electrode, which is based on Pt supported on mesoporous titanium chromium nitrides (Pt/Ti0.5Cr0.5N). Its desirable characteristics are due to its high electrochemical stability and strong metal-support interactions. The Pt/Ti0.5Cr0.5N-based sensors exhibit a much smaller attenuation (1.3%) in response to H2S than Pt/C-sensor (40%), after 2 months sensing test. Furthermore, the Pt/Ti0.5Cr0.5N-based sensors exhibit negligible cross response to other interfering gases compared with hydrogen sulfide. Results of density functional theory calculation also verify the excellent long-term stability and selectivity of the gas sensor. Our work hence points to a new sensing electrode system that offers a combination of high performance and stability for fuel-cell gas sensors.
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