期刊
NANOSCALE RESEARCH LETTERS
卷 8, 期 -, 页码 -出版社
SPRINGER
DOI: 10.1186/1556-276X-8-113
关键词
Electrochemistry; Activity; AuPd; Formic acid oxidation; Core-shell; Fuel cell
资金
- National Science Foundation [ECCS-0901849, CMMI-1000831]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1000831] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [0901849] Funding Source: National Science Foundation
A facile method has been developed to synthesize Au/Pd core-shell nanoparticles via galvanic replacement of Cu by Pd on hollow Au nanospheres. The unique nanoparticles were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, ultraviolet-visible spectroscopy, and electrochemical measurements. When the concentration of the Au solution was decreased, grain size of the polycrystalline hollow Au nanospheres was reduced, and the structures became highly porous. After the Pd shell formed on these Au nanospheres, the morphology and structure of the Au/Pd nanoparticles varied and hence significantly affected the catalytic properties. The Au/Pd nanoparticles synthesized with reduced Au concentrations showed higher formic acid oxidation activity (0.93 mA cm(-2) at 0.3 V) than the commercial Pd black (0.85 mA cm(-2) at 0.3 V), suggesting a promising candidate as fuel cell catalysts. In addition, the Au/Pd nanoparticles displayed lower CO-stripping potential, improved stability, and higher durability compared to the Pd black due to their unique core-shell structures tuned by Au core morphologies.
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