Hydrogen sensing performance and stability of WO3–SiO2 composite film doped with Pt catalyst

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS Journal of Sol-Gel Science and Technology Pub Date : 2024-12-05 DOI:10.1007/s10971-024-06635-y

Chihiro Tajima, Kyosuke Sawada, Shinji Okazaki, Naoya Kasai

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Abstract

Hydrogen energy has attracted attention as a new energy carrier because it does not generate CO₂ emissions during combustion. However, numerous problems face the establishment of a hydrogen infrastructure society. One problem is safety when using hydrogen. A fast sensing system for hydrogen at low concentrations will be needed for hydrogen to be used safely. WO₃ is expected to be used as an optical hydrogen sensor element because it reacts with hydrogen and changes color. We prepared Pt-doped WO₃ films by the sol–gel method using an ion-exchange technique under various experimental conditions and investigated the films’ response properties to hydrogen and their morphology. As a result, a Pt/WO₃ film with SiO₂ (Pt/WO₃–SiO₂ film) annealed at 200 °C showed the shortest coloring and bleaching time to 4 vol% hydrogen. The films also showed good reproducibility with respect to their hydrogen response and good long-term stability. In addition, the fast bleaching time led to a stable repeated response, enabling the films to be used in real-time monitoring applications. Moreover, the sensitivity of the Pt/WO₃–SiO₂ films depended on the hydrogen concentration, which suggested that quantitative sensing of hydrogen at concentrations below the lower explosive limit could be realized. Furthermore, the catalyst Pt active state and the difference in gas diffusivity due to the microstructure of the films were considered through analysis of the surface, cross-sectional structure, and elemental state of the films.

Graphical Abstract

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来源期刊

Journal of Sol-Gel Science and Technology 工程技术-材料科学：硅酸盐

CiteScore

4.70

自引率

4.00%

发文量

280

审稿时长

2.1 months

期刊介绍： The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.