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

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 structur...

Full description

Saved in:
Bibliographic Details
Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2019-06, Vol.842, p.1-7
Main Authors: Takahashi, Shuntaro, Todoroki, Naoto, Myochi, Rikiya, Nagao, Tetsuro, Taguchi, Noboru, Ioroi, Tsutomu, Feiten, Felix E., Wakisaka, Yuki, Asakura, Kiyotaka, Sekizawa, Oki, Sakata, Tomohiro, Higashi, Kotaro, Uruga, Tomoya, Iwasawa, Yasuhiro, Wadayama, Toshimasa
Format: Article
Language:English
Subjects:
Arc-plasma deposition
Compressive properties
Coordination
Core-shell nanoparticles
Core-shell particles
Energy transmission
Fine structure
Fluorescence
Gold
Lattice strain
Mapping
Microstructure
Nanoparticles
Oxygen reduction reaction
Oxygen reduction reactions
Platinum
Pt–Co alloy
Scanning electron microscopy
Scanning transmission electron microscopy
Shell stability
Structural stability
Surface Au termination
Transmission electron microscopy
X ray absorption
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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. [Display omitted] •Au-modified PtCo@Pt core-shell nanoparticles were synthesized.•Au preferentially locates at surface low-coordination sites.•Electrocatalytic oxygen reduction reaction (ORR) properties were evaluated.•Surface Au contributed to ORR durability improvement of the PtCo@Pt nanoparticles.
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2019.04.053