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

Ji Hoon Jang; Eunjik Lee; Jinwoo Park; Gunn Kim; Suklyun Hong; Young Uk Kwon

doi:10.1038/srep02872

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

Ji Hoon Jang, Eunjik Lee, Jinwoo Park, Gunn Kim, Suklyun Hong, Young Uk Kwon

Department of Chemistry

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80 Scopus citations

Abstract

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.

Original language	English
Article number	2872
Journal	Scientific Reports
Volume	3
DOIs	https://doi.org/10.1038/srep02872
State	Published - 2013

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title = "Rational syntheses of core-shell Fe x @Pt nanoparticles for the study of electrocatalytic oxygen reduction reaction",

abstract = "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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T1 - Rational syntheses of core-shell Fe x @Pt nanoparticles for the study of electrocatalytic oxygen reduction reaction

AU - Jang, Ji Hoon

AU - Lee, Eunjik

AU - Park, Jinwoo

AU - Kim, Gunn

AU - Hong, Suklyun

AU - Kwon, Young Uk

PY - 2013

Y1 - 2013

N2 - 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.

AB - 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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SN - 2045-2322

VL - 3

JO - Scientific Reports

JF - Scientific Reports

M1 - 2872

ER -

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

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