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Pt-decorated hierarchical SiC nanofibers constructed by intertwined SiC nanorods for high-temperature ammonia gas sensing

Abstract

In this work, novel hierarchical SiC nanofibers (HSiC) constructed by intertwined SiC nanorods were fabricated through electrospinning and catalyst-assisted pyrolysis routes. HSiC possessed a high surface area of 108.7 m2 g-1 and interconnected porous structure. Platinum nanoparticles with size of 2-3 nm were homogeneously deposited onto SiC nanorods (Pt/HSiC) via ethylene glycol reduction method. When applied to detect 500 ppm NH3 at 500 °C, the sensor based on Pt/HSiC demonstrated a sensitivity of 9.1% and short response/recovery time of 2 s/5 s. Moreover, the sensor exhibited a low detection limit of 1 ppm NH3 and excellent repeatability. The outstanding performance is attributed to the hierarchically interconnected macro-meso-porous structure, which provides more effective active sites and facilitates the gas diffusion. A proposed mechanism for the increasing resistance under NH3 atmosphere was based on the stronger spill-over mechanism and dipolar layer effect. The successful synthesis of HSiC may provide a potential catalyst support for applications in high-temperature and corrosive environments.

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Publication details

The article was received on 11 Mar 2019, accepted on 08 May 2019 and first published on 10 May 2019


Article type: Paper
DOI: 10.1039/C9TC01330J
J. Mater. Chem. C, 2019, Accepted Manuscript

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    Pt-decorated hierarchical SiC nanofibers constructed by intertwined SiC nanorods for high-temperature ammonia gas sensing

    N. Wu, B. Wang, C. han, Q. Tian, C. Wu, X. Zhang, L. Sun and Y. wang, J. Mater. Chem. C, 2019, Accepted Manuscript , DOI: 10.1039/C9TC01330J

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