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A-site non-stoichiometric defects engineering in xPt–La0.9Fe0.75Sn0.25O3−δ hollow nanofiber for high-performance formaldehyde sensor.
- Source :
- Journal of Materials Chemistry C; 12/21/2022, Vol. 10 Issue 47, p17907-17916, 10p
- Publication Year :
- 2022
-
Abstract
- Artificially inducing abundant oxygen vacancies in perovskite-structured materials is an effective method to improve sensing activity. In this work, we prepared a highly sensitive and stable La<subscript>0.9</subscript>Fe<subscript>0.75</subscript>Sn<subscript>0.25</subscript>O<subscript>3−δ</subscript> hollow nanofiber by introducing A-site cation defects in LaFeO<subscript>3</subscript> by electrostatic spinning technique, then combined with a water bath method to uniformly load the surface of La<subscript>0.9</subscript>Fe<subscript>0.75</subscript>Sn<subscript>0.25</subscript>O<subscript>3−δ</subscript> with well dispersed xPt (x = 0, 0.5%, 1%, and 1.5%, 2%) elements. Compared with La<subscript>0.9</subscript>Fe<subscript>0.75</subscript>Sn<subscript>0.25</subscript>O<subscript>3−δ</subscript> without Pt modification, the xPt–La<subscript>0.9</subscript>Fe<subscript>0.75</subscript>Sn<subscript>0.25</subscript>O<subscript>3−δ</subscript> sensing materials exhibited an excellent response to formaldehyde and greatly improved the overall performance of the sensing electrode, especially 1.5%Pt–La<subscript>0.9</subscript>Fe<subscript>0.75</subscript>Sn<subscript>0.25</subscript>O<subscript>3−δ</subscript>, achieving a response of 137 for 10 ppm formaldehyde at 160 °C, which is a significant improvement compared to the intrinsic LaFeO<subscript>3</subscript>. The improved gas-sensitive achievement is based on the abundant oxygen vacancies induced by the A-site cation defect, the large specific surface area, and the high catalytic activity of Pt(O) elements. This strategy of inducing abundant oxygen vacancies by artificially creating A-site cation defects and modifying noble metals can be used to develop more advanced and novel sensing electrodes. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20507526
- Volume :
- 10
- Issue :
- 47
- Database :
- Complementary Index
- Journal :
- Journal of Materials Chemistry C
- Publication Type :
- Academic Journal
- Accession number :
- 160680322
- Full Text :
- https://doi.org/10.1039/d2tc04185e