Mesoporous Ti0.5Cr0.5N for trace H2S detection with excellent long-term stability

JOURNAL OF HAZARDOUS MATERIALS

卷:423

Article

Huang, Chaozhu^1,2  Liu, Dongliang¹  Wang, Dongting¹  Guo, Haichuan¹  Thomas, Tiju³  Attfield, J. Paul⁴  Qu, Fengdong^1,5  Ruan, Shengping⁵  Yang, Minghui^1,2 

[1] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Peoples R China

[2] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China

[3] Indian Inst Technol Madras Adyar, Dept Met & Mat Engn, Chennai 600036, Tamil Nadu, India

[4] Univ Edinburgh, Ctr Sci Extreme Condit, Kings Bldg,Mayfield Rd, Edinburgh EH9 3JZ, Midlothian, Scotland

[5] Jilin Univ, Coll Elect Sci & Engn, State Key Lab Integrated Optoelect, Changchun 130012, Peoples R China

关键词: Solid-solid separation method;    Ti0.5Cr0.5N;    Room-temperature;    Fuel cell gas sensor;    Hydrogen sulfide;   

DOI  :  10.1016/j.jhazmat.2021.127193

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

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