TY - JOUR
T1 - Effective surface termination with Au on PtCo@Pt core-shell nanoparticle
T2 - Microstructural investigations and oxygen reduction reaction properties
AU - Takahashi, Shuntaro
AU - Todoroki, Naoto
AU - Myochi, Rikiya
AU - Nagao, Tetsuro
AU - Taguchi, Noboru
AU - Ioroi, Tsutomu
AU - Feiten, Felix E.
AU - Wakisaka, Yuki
AU - Asakura, Kiyotaka
AU - Sekizawa, Oki
AU - Sakata, Tomohiro
AU - Higashi, Kotaro
AU - Uruga, Tomoya
AU - Iwasawa, Yasuhiro
AU - Wadayama, Toshimasa
N1 - Funding Information:
This study was supported by the New Energy and Industrial Technology Development Organization (NEDO) of Japan, a Grant-in-Aid for Challenging Exploratory Research from the Japan Society for the Promotion of Science ( 16K14397 ), and by the Cooperative Research Program of Institute for Catalysis, Hokkaido University (Grant # 16B1024 ). Synchrotron radiation experiments were performed at the BL36XU beamline of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal Nos. 2016B7905, 2017B7905).
Funding Information:
This study was supported by the New Energy and Industrial Technology Development Organization (NEDO) of Japan, a Grant-in-Aid for Challenging Exploratory Research from the Japan Society for the Promotion of Science (16K14397), and by the Cooperative Research Program of Institute for Catalysis, Hokkaido University (Grant #16B1024). Synchrotron radiation experiments were performed at the BL36XU beamline of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal Nos. 2016B7905, 2017B7905). The authors declare no competing financial interests.
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/6/1
Y1 - 2019/6/1
N2 - 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.
AB - 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.
KW - Arc-plasma deposition
KW - Core-shell nanoparticles
KW - Oxygen reduction reaction
KW - Pt–Co alloy
KW - Surface Au termination
UR - http://www.scopus.com/inward/record.url?scp=85064932520&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85064932520&partnerID=8YFLogxK
U2 - 10.1016/j.jelechem.2019.04.053
DO - 10.1016/j.jelechem.2019.04.053
M3 - Article
AN - SCOPUS:85064932520
SN - 1572-6657
VL - 842
SP - 1
EP - 7
JO - Journal of Electroanalytical Chemistry
JF - Journal of Electroanalytical Chemistry
ER -