A-site non-stoichiometric defects engineering in xPt–La0.9Fe0.75Sn0.25O3−δ hollow nanofiber for high-performance formaldehyde sensor. Issue 47 (11th November 2022)

• Record Type: Journal Article
• Authors: Xu, Dong; Zhang, Yumin; Zhu, Qin; Song, Zhenlin; Deng, Zongming; Zi, Baoye; Zhang, Jin; Zhao, Jianhong; Liu, Qingju
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 47(2022)
• Page Start: 17907
• Page End: 17916
• Publication Date: 2022-11-11
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2tc04185e
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Artificially inducing abundant oxygen vacancies in perovskite-structured materials is an effective method to improve sensing activity. 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 La0.9 Fe0.75 Sn0.25 O3− δ hollow nanofiber by introducing A-site cation defects in LaFeO3 by electrostatic spinning technique, then combined with a water bath method to uniformly load the surface of La0.9 Fe0.75 Sn0.25 O3− δ with well dispersed x Pt ( x = 0, 0.5%, 1%, and 1.5%, 2%) elements. Compared with La0.9 Fe0.75 Sn0.25 O3− δ without Pt modification, the x Pt–La0.9 Fe0.75 Sn0.25 O3− δ sensing materials exhibited an excellent response to formaldehyde and greatly improved the overall performance of the sensing electrode, especially 1.5%Pt–La0.9 Fe0.75 Sn0.25 O3− δ, achieving a response of 137 for 10 ppm formaldehyde at 160 °C, which is a significant improvement compared to the intrinsic LaFeO3 . 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.