期刊
SCIENTIFIC REPORTS
卷 3, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/srep02872
关键词
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资金
- Sungkyunkwan University
- Nano Material Technology Development Program [2012M3A7B4049888]
- National Research Foundation of Korea(NRF)
- Ministry of Education [2010-0020207, 2009-0094023, 2009-0083540]
We report on the syntheses of core-shell Fe-x@Pt (x = 0.4-1.2) nanoparticles (NPs) with Pt-shell thickness systematically controlled while the overall particle size is constant. The syntheses were achieved via one-pot ultrasound-assisted polyol synthesis (UPS) reactions. Fe-1.2@Pt showed a record-breaking high core-element content (55 at%) of core-shell NPs. Based on observations from a series of control experiments, we propose a mechanism of the NPs' formation that enables control of shell thickness in UPS reactions. Fe-x@Pt NPs showed drastic enhancements in mass and specific activity for oxygen reduction reaction (ORR) and significantly enhanced durability compared to commercial Pt NPs. Fe-x@Pt with a 1 (monolayer) ML Pt shell showed the highest activity. The ab initio density functional theory calculations on the binding energies of oxygen species on the surfaces of Fe-x@Pt NPs showed that the 1 ML case is most favourable for the ORR, and in good agreement with the experimental results.
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