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

Murata, Naoyoshi; Suzuki, Takuya; Lin, Yunli; Nitani, Hiroaki; Niwa, Yasuhiro; Wada, Takahiro; Uo, Motohiro; Asakura, Kiyotaka

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

Murata, Naoyoshi; Suzuki, Takuya; Lin, Yunli et al.

ACS applied materials & interfaces, 2023, 14(34), 39507-39514

Permalink : https://hdl.handle.net/2115/90327

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アクセス権	open access
URI	https://hdl.handle.net/2115/90327
タイトル	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
著者	Murata, Naoyoshi ; Suzuki, Takuya ; Lin, Yunli ; Nitani, Hiroaki ; Niwa, Yasuhiro ; Wada, Takahiro ; Uo, Motohiro ; Asakura, Kiyotaka
著者名 Murata, Naoyoshi
著者名 Suzuki, Takuya
著者名 Lin, Yunli
e-Rad_Researcher 20554603 著者名 Nitani, Hiroaki
e-Rad_Researcher 00743709 著者名 Niwa, Yasuhiro
e-Rad_Researcher 10632317 著者名 Wada, Takahiro
e-Rad_Researcher 20242042 著者名 Uo, Motohiro
e-Rad_Researcher 60175164 著者名 Asakura, Kiyotaka
言語	英語
キーワード	in situ XAFS
	Pt− SnO2
	solid-state
	reducing gas
	micro gas sensor
発行日	2023-08-31
出版者	American Chemical Society
収録物名	ACS applied materials & interfaces
巻(号)	14(34)
ページ	39507-39514
抄録	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.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	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
PISSN	1944-8244
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1021/acsami.2c09535