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Rational syntheses of core-shell Fe(x)@Pt nanoparticles for the study of electrocatalytic oxygen reduction reaction

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-...

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Detalles Bibliográficos
Autores principales: Jang, Ji-Hoon, Lee, Eunjik, Park, Jinwoo, Kim, Gunn, Hong, Suklyun, Kwon, Young-Uk
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3791448/
https://www.ncbi.nlm.nih.gov/pubmed/24096587
http://dx.doi.org/10.1038/srep02872
Descripción
Sumario: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.