Oxygen vacancies engineering and palladium quantum dots sensitized WO3 nanosheet for highly efficiently H2 detection

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science Pub Date : 2025-02-18 DOI:10.1016/j.apsusc.2025.162722

Beixi An, Yifan Yang, Jiaqi Yan, Yanrong Wang, Ruixia Li, Zhengkun Wu, Tingyu Zhang, Ruiqi Han, Xu Cheng, Qiao Wang, Erqing Xie

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引用次数: 0

Abstract

Palladium is widely used in hydrogen sensing due to its excellent catalytic dissociation of hydrogen. However, the size, dispersion and density of palladium particles affect its role in enhancing gas-sensitive properties. In this work, we use a simple and effective method to anchor Pd quantum dots with the help of surface oxygen vacancies. The sensing results show that the response value (S = R_a/R_g) of the material loaded with Pd quantum dots on surface oxygen vacancies (Pd-WO₃/WO_x) for 50 ppm hydrogen at 160℃ is 13.37. Moreover, the Pd-WO₃/WO_x material exhibits excellent selectivity and good linearity over the test range. Furthermore, experimental results and DFT calculations reveal that surface oxygen vacancies can shift the d-band center of metallic Pd upward, which enhances the adsorption of hydrogen by Pd. This study provides new ideas for designing high-performance precious metal-loaded metal oxide semiconductor hydrogen sensors.

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来源期刊

Applied Surface Science 工程技术-材料科学：膜

CiteScore

12.50

自引率

7.50%

发文量

3393

审稿时长

67 days

期刊介绍： Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.