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Structure of Atomically Dispersed Pt in a SnO2 Thin Film under Reaction Conditions : Origin of Its High Performance in Micro Electromechanical System Gas Sensor Catalysis
| Title: | Structure of Atomically Dispersed Pt in a SnO2 Thin Film under Reaction Conditions : Origin of Its High Performance in Micro Electromechanical System Gas Sensor Catalysis |
| Authors: | Murata, Naoyoshi Browse this author | | Suzuki, Takuya Browse this author | | Lin, Yunli Browse this author | | Nitani, Hiroaki Browse this author →KAKEN DB | | Niwa, Yasuhiro Browse this author →KAKEN DB | | Wada, Takahiro Browse this author →KAKEN DB | | Uo, Motohiro Browse this author →KAKEN DB | | Asakura, Kiyotaka Browse this author →KAKEN DB |
| Keywords: | in situ XAFS | | Pt− SnO2 | | solid-state | | reducing gas | | micro gas sensor |
| Issue Date: | 31-Aug-2023 |
| Publisher: | American Chemical Society |
| Journal Title: | ACS applied materials & interfaces |
| Volume: | 14 |
| Issue: | 34 |
| Start Page: | 39507 |
| End Page: | 39514 |
| Publisher DOI: | 10.1021/acsami.2c09535 |
| Abstract: | A battery-driven micro electromechanical system (MEMS) gas sensor has been developed for household safety when using natural gas. The heart of the MEMS gas sensor is a 7.5 at % Pt-SnO2 thin film catalyst deposited on the SnO2 sensor layer. The catalyst enhances the sensitivity to methane, though its structure under working conditions is unclear. In this study, in situ XAFS was applied to a 7.5 at % Pt-SnO2 catalyst layer deposited on a Si substrate, and we demonstrated that atomically dispersed Pt maintains its lattice position in SnO2 with a small loss of surrounding lattice oxygen in the presence of 1% CH4 and a more reducing gas of 1% H-2 at the reaction temperature (703 K), i.e., no Pt aggregation is observed. The lost oxygen is easily recovered by re-oxidation by air. This work has revealed that the atomically dispersed Pt in the SnO2 lattice is the active structure and it is stable even under reaction conditions, which guarantees a long lifetime for the gas sensor. |
| Rights: | This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS applied materials & interfaces, copyright © 2022 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/articlesonrequest/AOR-HDR5VGHKJSZBNJKRIQTY |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/90327 |
| Appears in Collections: | 触媒科学研究所 (Institute for Catalysis) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 朝倉 清高
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