Oxygen reduction reaction activities for various-monolayer-thick Pt shells on PtxNi100-x(111)

Masato Asano; Ryutaro Kawamura; Naoto Todoroki; Toshimasa Wadayama

doi:10.1149/06917.0619ecst

Oxygen reduction reaction activities for various-monolayer-thick Pt shells on Pt_xNi_100-x(111)

Masato Asano, Ryutaro Kawamura, Naoto Todoroki, Toshimasa Wadayama

ENV - Frontier Science for Advanced Environment

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

We studied the oxygen reduction reaction (ORR) activities for two monolayer (ML)-thick Pt on Pt_xNi_100-x(111) (Pt_2ML/Pt_xNi_100-x(111)) model core-shell catalysts fabricated by molecular beam epitaxy (MBE). Low-energy electron diffraction patterns for all Pt_2ML/Pt_xNi_100-x(111) showed six-fold surface symmetry with longrange ordering, indicating a (111) atomic arrangement of the topmost Pt shell layers. Furthermore, scanning tunneling microscopy images of the Pt_2ML/Pt₅₀Ni₅₀(111) and Pt_2ML/Pt₂₅Ni₇₅(111) surfaces exhibited Moiré-like height modulations, which are likely induced by large lattice mismatches between the topmost Pt(111) shell layers and the Pt-Ni(111) substrates. The ORR activity of Pt_2ML/Pt_xNi_100-x(111) increased with the Ni composition; the enhancement factors are 8-, 18-, and 25-fold vs. Pt(111) for Pt_2ML/Pt₇₅Ni₂₅(111), Pt_2ML/Pt₅₀Ni₅₀(111), and Pt_2ML/Pt₂₅Ni₇₅(111), respectively. The results suggested that the Pt surface strains induced by lattice mismatches between the Pt shells and Pt-Ni substrates increased with the Ni composition, leading to a marked enhancement in ORR activity, particularly for Pt_2ML/Pt₂₅Ni₇₅(111).

Original language	English
Title of host publication	Polymer Electrolyte Fuel Cells 15, PEFC 15
Editors	H. A. Gasteiger, V. K. Ramani, J. M. Fenton, T. J. Schmidt, D. J. Jones, K. E. Ayers, K. A. Perry, T. F. Fuller, B. S. Pivovar, K. Shinohara, F. N. Buchi, R. A. Mantz, C. Coutanceau, P. Strasser, A. Z. Weber, K. Swider-Lyons, H. Uchida, M. Edmundson, S. Mitsushima, S. R. Narayanan
Publisher	Electrochemical Society Inc.
Pages	619-624
Number of pages	6
Edition	17
ISBN (Electronic)	9781607685395
DOIs	https://doi.org/10.1149/06917.0619ecst
Publication status	Published - 2015 Jan 1
Event	Symposium on Polymer Electrolyte Fuel Cells 15, PEFC 2015 - 228th ECS Meeting - Phoenix, United States Duration: 2015 Oct 11 → 2015 Oct 15

Publication series

Name	ECS Transactions
Number	17
Volume	69
ISSN (Print)	1938-5862
ISSN (Electronic)	1938-6737

Other

Other	Symposium on Polymer Electrolyte Fuel Cells 15, PEFC 2015 - 228th ECS Meeting
Country	United States
City	Phoenix
Period	15/10/11 → 15/10/15

ASJC Scopus subject areas

Engineering(all)

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10.1149/06917.0619ecst

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Asano, M., Kawamura, R., Todoroki, N., & Wadayama, T. (2015). Oxygen reduction reaction activities for various-monolayer-thick Pt shells on Pt_xNi_100-x(111). In H. A. Gasteiger, V. K. Ramani, J. M. Fenton, T. J. Schmidt, D. J. Jones, K. E. Ayers, K. A. Perry, T. F. Fuller, B. S. Pivovar, K. Shinohara, F. N. Buchi, R. A. Mantz, C. Coutanceau, P. Strasser, A. Z. Weber, K. Swider-Lyons, H. Uchida, M. Edmundson, S. Mitsushima, & S. R. Narayanan (Eds.), Polymer Electrolyte Fuel Cells 15, PEFC 15 (17 ed., pp. 619-624). (ECS Transactions; Vol. 69, No. 17). Electrochemical Society Inc.. https://doi.org/10.1149/06917.0619ecst

Oxygen reduction reaction activities for various-monolayer-thick Pt shells on Pt_xNi_100-x(111). / Asano, Masato; Kawamura, Ryutaro; Todoroki, Naoto ; Wadayama, Toshimasa.

Polymer Electrolyte Fuel Cells 15, PEFC 15. ed. / H. A. Gasteiger; V. K. Ramani; J. M. Fenton; T. J. Schmidt; D. J. Jones; K. E. Ayers; K. A. Perry; T. F. Fuller; B. S. Pivovar; K. Shinohara; F. N. Buchi; R. A. Mantz; C. Coutanceau; P. Strasser; A. Z. Weber; K. Swider-Lyons; H. Uchida; M. Edmundson; S. Mitsushima; S. R. Narayanan. 17. ed. Electrochemical Society Inc., 2015. p. 619-624 (ECS Transactions; Vol. 69, No. 17).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Asano, M, Kawamura, R, Todoroki, N & Wadayama, T 2015, Oxygen reduction reaction activities for various-monolayer-thick Pt shells on Pt_xNi_100-x(111). in HA Gasteiger, VK Ramani, JM Fenton, TJ Schmidt, DJ Jones, KE Ayers, KA Perry, TF Fuller, BS Pivovar, K Shinohara, FN Buchi, RA Mantz, C Coutanceau, P Strasser, AZ Weber, K Swider-Lyons, H Uchida, M Edmundson, S Mitsushima & SR Narayanan (eds), Polymer Electrolyte Fuel Cells 15, PEFC 15. 17 edn, ECS Transactions, no. 17, vol. 69, Electrochemical Society Inc., pp. 619-624, Symposium on Polymer Electrolyte Fuel Cells 15, PEFC 2015 - 228th ECS Meeting, Phoenix, United States, 15/10/11. https://doi.org/10.1149/06917.0619ecst

Asano M, Kawamura R, Todoroki N , Wadayama T. Oxygen reduction reaction activities for various-monolayer-thick Pt shells on Pt_xNi_100-x(111). In Gasteiger HA, Ramani VK, Fenton JM, Schmidt TJ, Jones DJ, Ayers KE, Perry KA, Fuller TF, Pivovar BS, Shinohara K, Buchi FN, Mantz RA, Coutanceau C, Strasser P, Weber AZ, Swider-Lyons K, Uchida H, Edmundson M, Mitsushima S, Narayanan SR, editors, Polymer Electrolyte Fuel Cells 15, PEFC 15. 17 ed. Electrochemical Society Inc. 2015. p. 619-624. (ECS Transactions; 17). https://doi.org/10.1149/06917.0619ecst

Asano, Masato ; Kawamura, Ryutaro ; Todoroki, Naoto ; Wadayama, Toshimasa. / Oxygen reduction reaction activities for various-monolayer-thick Pt shells on Pt_xNi_100-x(111). Polymer Electrolyte Fuel Cells 15, PEFC 15. editor / H. A. Gasteiger ; V. K. Ramani ; J. M. Fenton ; T. J. Schmidt ; D. J. Jones ; K. E. Ayers ; K. A. Perry ; T. F. Fuller ; B. S. Pivovar ; K. Shinohara ; F. N. Buchi ; R. A. Mantz ; C. Coutanceau ; P. Strasser ; A. Z. Weber ; K. Swider-Lyons ; H. Uchida ; M. Edmundson ; S. Mitsushima ; S. R. Narayanan. 17. ed. Electrochemical Society Inc., 2015. pp. 619-624 (ECS Transactions; 17).

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title = "Oxygen reduction reaction activities for various-monolayer-thick Pt shells on PtxNi100-x(111)",

abstract = "We studied the oxygen reduction reaction (ORR) activities for two monolayer (ML)-thick Pt on PtxNi100-x(111) (Pt2ML/PtxNi100-x(111)) model core-shell catalysts fabricated by molecular beam epitaxy (MBE). Low-energy electron diffraction patterns for all Pt2ML/PtxNi100-x(111) showed six-fold surface symmetry with longrange ordering, indicating a (111) atomic arrangement of the topmost Pt shell layers. Furthermore, scanning tunneling microscopy images of the Pt2ML/Pt50Ni50(111) and Pt2ML/Pt25Ni75(111) surfaces exhibited Moir{\'e}-like height modulations, which are likely induced by large lattice mismatches between the topmost Pt(111) shell layers and the Pt-Ni(111) substrates. The ORR activity of Pt2ML/PtxNi100-x(111) increased with the Ni composition; the enhancement factors are 8-, 18-, and 25-fold vs. Pt(111) for Pt2ML/Pt75Ni25(111), Pt2ML/Pt50Ni50(111), and Pt2ML/Pt25Ni75(111), respectively. The results suggested that the Pt surface strains induced by lattice mismatches between the Pt shells and Pt-Ni substrates increased with the Ni composition, leading to a marked enhancement in ORR activity, particularly for Pt2ML/Pt25Ni75(111).",

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N2 - We studied the oxygen reduction reaction (ORR) activities for two monolayer (ML)-thick Pt on PtxNi100-x(111) (Pt2ML/PtxNi100-x(111)) model core-shell catalysts fabricated by molecular beam epitaxy (MBE). Low-energy electron diffraction patterns for all Pt2ML/PtxNi100-x(111) showed six-fold surface symmetry with longrange ordering, indicating a (111) atomic arrangement of the topmost Pt shell layers. Furthermore, scanning tunneling microscopy images of the Pt2ML/Pt50Ni50(111) and Pt2ML/Pt25Ni75(111) surfaces exhibited Moiré-like height modulations, which are likely induced by large lattice mismatches between the topmost Pt(111) shell layers and the Pt-Ni(111) substrates. The ORR activity of Pt2ML/PtxNi100-x(111) increased with the Ni composition; the enhancement factors are 8-, 18-, and 25-fold vs. Pt(111) for Pt2ML/Pt75Ni25(111), Pt2ML/Pt50Ni50(111), and Pt2ML/Pt25Ni75(111), respectively. The results suggested that the Pt surface strains induced by lattice mismatches between the Pt shells and Pt-Ni substrates increased with the Ni composition, leading to a marked enhancement in ORR activity, particularly for Pt2ML/Pt25Ni75(111).

AB - We studied the oxygen reduction reaction (ORR) activities for two monolayer (ML)-thick Pt on PtxNi100-x(111) (Pt2ML/PtxNi100-x(111)) model core-shell catalysts fabricated by molecular beam epitaxy (MBE). Low-energy electron diffraction patterns for all Pt2ML/PtxNi100-x(111) showed six-fold surface symmetry with longrange ordering, indicating a (111) atomic arrangement of the topmost Pt shell layers. Furthermore, scanning tunneling microscopy images of the Pt2ML/Pt50Ni50(111) and Pt2ML/Pt25Ni75(111) surfaces exhibited Moiré-like height modulations, which are likely induced by large lattice mismatches between the topmost Pt(111) shell layers and the Pt-Ni(111) substrates. The ORR activity of Pt2ML/PtxNi100-x(111) increased with the Ni composition; the enhancement factors are 8-, 18-, and 25-fold vs. Pt(111) for Pt2ML/Pt75Ni25(111), Pt2ML/Pt50Ni50(111), and Pt2ML/Pt25Ni75(111), respectively. The results suggested that the Pt surface strains induced by lattice mismatches between the Pt shells and Pt-Ni substrates increased with the Ni composition, leading to a marked enhancement in ORR activity, particularly for Pt2ML/Pt25Ni75(111).

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