Oxygen Reduction Reaction Activity Enhancement of Dry-Process-Synthesized Pt(111)/Nb:SnO₂(101)/Pt(111) Coherent Lattice Stacking Model Catalyst Surface
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- Chida Yoshihiro
- Graduate School of Environmental Studies, Tohoku University
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- Kamikawa Hikaru
- Graduate School of Environmental Studies, Tohoku University
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- Todoroki Naoto
- Graduate School of Environmental Studies, Tohoku University
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- Wadayama Toshimasa
- Graduate School of Environmental Studies, Tohoku University
書誌事項
- タイトル別名
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- Oxygen Reduction Reaction Activity Enhancement of Dry-Process-Synthesized Pt(111)/Nb:SnO<sub>2</sub>(101)/Pt(111) Coherent Lattice Stacking Model Catalyst Surface
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<p>We synthesized an oxygen reduction reaction (ORR) model catalyst surface of Pt(111)/Nb-doped SnO2(101) (Nb:SnO2) coherent lattice stacking layers on a Pt(111) substrate and investigated the influence of the surface strain of the Pt(111) layer on ORR activity enhancement. The Nb:SnO2 lattice stacking layer was synthesized through arc-plasma deposition (APD) of SnNb on Pt(111) in a vacuum chamber (base pressure <10−7 Pa), followed by thermal annealing at 823 K for 120 min under 1 atm of dry air. The resulting Nb:SnO2/Pt(111) was then re-introduced into the chamber, and Pt was deposited by using an e-beam deposition method to form Pt/Nb:SnO2/Pt(111) ORR model catalyst surface. The cross-sectional, atomically resolved HAADF-STEM image of Pt/Nb:SnO2/Pt(111) clearly shows that the interfaces between the substrate Pt(111)/Nb:SnO2(101) and the Nb:SnO2(101)/surface Pt(111) match well and generate a single-crystal Pt(111)/Nb:SnO2(101)/Pt(111) ORR model catalyst surface. The synthesized catalyst surface showed ca. 3 times higher activity compared with clean Pt(111). It was estimated by in-plane-XRD that 0.6% of compressive strain worked on the surface Pt(111) layer, which was induced by a lattice mismatch between the surface Pt(111) and the underlaid Nb:SnO2(101). The results suggest that the ORR activity enhancement mechanism of the compressively strained surface Pt(111) lattice can be applied not only to Pt-based alloys of Pt and transition metal elements with smaller atomic radii but also to Pt on ceramic supports, such as SnO2.</p>
収録刊行物
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 65 (2), 125-129, 2024-02-01
公益社団法人 日本金属学会
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詳細情報 詳細情報について
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- CRID
- 1390298919730955776
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- NII書誌ID
- AA1151294X
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- ISSN
- 13475320
- 13459678
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- NDL書誌ID
- 033304044
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
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- 抄録ライセンスフラグ
- 使用不可