Effects of core-shell interface structures on ORR activities: A model catalyst study of Pt/Pd(111)

Naoto Todoroki, Yohe Bando, Hirofumi Watanabe, Toshimasa Wadayama

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

We investigated surface structures and oxygen-reduction reactions (ORR) of Pt-Pd(111) model bimetallic surfaces fabricated by molecular beam epitaxy. The Pt/Pd(111) surfaces were prepared by depositing 0.6-nm-thick Pt on Pd(111) at substrate temperatures of 573 and 673 (xK-Pt0.6nm/Pd(111), where x = 573 or 673). Reflection high-energy electron diffraction patterns and ultra-highvacuum scanning tunneling microscopy images revealed that Pt grew epitaxially on the Pd(111) substrate under the deposition conditions selected for the study. However, analysis of low-energy ion scattering results suggested that the Pt and Pd atomic compositions of the topmost surfaces were different for 573KPt0.6nm/ Pd(111) and 673K-Pt0.6nm/Pd(111). The ORR activities of the 573K-Pt0.6nm/Pd(111) and 673K-Pt0.6nm/Pd(111) surfaces were 6.3 and 3.6 higher than that for Pt(111), respectively. The results indicate that alloy structures near the surface determine the ORR activity of practical Pd@Pt core-shell catalysts.

Original languageEnglish
Title of host publicationPolymer Electrolyte Fuel Cells 15, PEFC 15
EditorsH. 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
PublisherElectrochemical Society Inc.
Pages315-320
Number of pages6
Edition17
ISBN (Electronic)9781607685395
DOIs
Publication statusPublished - 2015 Jan 1
EventSymposium on Polymer Electrolyte Fuel Cells 15, PEFC 2015 - 228th ECS Meeting - Phoenix, United States
Duration: 2015 Oct 112015 Oct 15

Publication series

NameECS Transactions
Number17
Volume69
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

OtherSymposium on Polymer Electrolyte Fuel Cells 15, PEFC 2015 - 228th ECS Meeting
CountryUnited States
CityPhoenix
Period15/10/1115/10/15

ASJC Scopus subject areas

  • Engineering(all)

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    Todoroki, N., Bando, Y., Watanabe, H., & Wadayama, T. (2015). Effects of core-shell interface structures on ORR activities: A model catalyst study of Pt/Pd(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. 315-320). (ECS Transactions; Vol. 69, No. 17). Electrochemical Society Inc.. https://doi.org/10.1149/06917.0315ecst