Effective surface termination with Au on PtCo@Pt core-shell nanoparticle: Microstructural investigations and oxygen reduction reaction properties

Shuntaro Takahashi, Naoto Todoroki, Rikiya Myochi, Tetsuro Nagao, Noboru Taguchi, Tsutomu Ioroi, Felix E. Feiten, Yuki Wakisaka, Kiyotaka Asakura, Oki Sekizawa, Tomohiro Sakata, Kotaro Higashi, Tomoya Uruga, Yasuhiro Iwasawa, Toshimasa Wadayama

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

We investigated the microstructures of Au-deposited PtCo@Pt core-shell nanoparticles (NPs) and discussed enhancement of the oxygen reduction reaction (ORR) properties by Au termination of low-coordination sites of the Pt-shell. The Au-deposited PtCo@Pt NPs showed an improved electrochemical structural stability, together with slight increment in increased initial, pristine area-specific activity relative to the non-Au-deposited PtCo@Pt NPs. Atomic-level microstructural characterization was performed by a back-side illumination fluorescence X-ray absorption fine structure (BI-FXAFS) method and scanning transmission electron microscopy with energy dispersive spectroscopy (STEM-EDS). The BI-FXAFS results indicated that compressive lattice strain in the Pt-shells of the PtCo@Pt NPs was almost unchanged by the subsequent Au deposition. Furthermore, STEM-EDS mapping of Pt, Co, and Au clearly showed that the deposited Au tended to localize at low-coordination sites of the Pt-shell surface, e.g., edges and corners. The atomic-level microstructural characterization conducted in this study demonstrated that effective Au surface terminations of the Pt-shell enhance the ORR durability of Pt-based core-shell type NP catalysts.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalJournal of Electroanalytical Chemistry
Volume842
DOIs
Publication statusPublished - 2019 Jun 1

Keywords

  • Arc-plasma deposition
  • Core-shell nanoparticles
  • Oxygen reduction reaction
  • Pt–Co alloy
  • Surface Au termination

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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