Ultrasensitive and selective hydrogen sensing of SnO2 nanofibers decorated with Pd single atoms
Highly accurate and sensitive hydrogen detection particularly at (sub)ppb level is crucial for large-scale use of green hydrogen energy. However, state-of-the-art hydrogen sensors usually have a ppm-level limit of detection (LOD). In this work, SnO2 nanofibers were decorated with Pd single atoms usi...
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| Published in: | Sensors and actuators. B, Chemical Vol. 416; p. 136022 |
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| Format: | Journal Article |
| Language: | English |
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Elsevier B.V
01.10.2024
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| ISSN: | 0925-4005, 1873-3077 |
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| Abstract | Highly accurate and sensitive hydrogen detection particularly at (sub)ppb level is crucial for large-scale use of green hydrogen energy. However, state-of-the-art hydrogen sensors usually have a ppm-level limit of detection (LOD). In this work, SnO2 nanofibers were decorated with Pd single atoms using a scalable two-step annealing method, which remarkably boosted the H2 sensing properties. The Pd-SnO2 nanofiber sensor exhibited a response of 224 to 1000 ppm H2 at the optimum operation temperature of 300°C, which was 107 times higher than that of SnO2, achieving an LOD as low as 0.6 ppb. Moreover, a fast response time of 8.4 s, excellent selectivity, and humidity tolerance were observed. The superior H2 sensing performance of Pd-SnO2 nanofiber was ascribed to excellent catalysis of Pd single atoms and formation of heterojunction.
•SnO2 nanofibers decorated with Pd single atoms were fabricated.•Pd-SnO2 exhibited 107-fold higher response to 1000 ppm H2 at 300 °C than SnO2.•A limit of detection down to 0.6 ppb H2 was obtained.•Superior performance was ascribed to Pd catalysis and heterojunction formation. |
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| AbstractList | Highly accurate and sensitive hydrogen detection particularly at (sub)ppb level is crucial for large-scale use of green hydrogen energy. However, state-of-the-art hydrogen sensors usually have a ppm-level limit of detection (LOD). In this work, SnO2 nanofibers were decorated with Pd single atoms using a scalable two-step annealing method, which remarkably boosted the H2 sensing properties. The Pd-SnO2 nanofiber sensor exhibited a response of 224 to 1000 ppm H2 at the optimum operation temperature of 300°C, which was 107 times higher than that of SnO2, achieving an LOD as low as 0.6 ppb. Moreover, a fast response time of 8.4 s, excellent selectivity, and humidity tolerance were observed. The superior H2 sensing performance of Pd-SnO2 nanofiber was ascribed to excellent catalysis of Pd single atoms and formation of heterojunction.
•SnO2 nanofibers decorated with Pd single atoms were fabricated.•Pd-SnO2 exhibited 107-fold higher response to 1000 ppm H2 at 300 °C than SnO2.•A limit of detection down to 0.6 ppb H2 was obtained.•Superior performance was ascribed to Pd catalysis and heterojunction formation. |
| ArticleNumber | 136022 |
| Author | Yi, Jianxin Xiang, Tao |
| Author_xml | – sequence: 1 givenname: Tao surname: Xiang fullname: Xiang, Tao – sequence: 2 givenname: Jianxin surname: Yi fullname: Yi, Jianxin email: yjx@ustc.edu.cn |
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| Title | Ultrasensitive and selective hydrogen sensing of SnO2 nanofibers decorated with Pd single atoms |
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