Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 3, Issue 33, Pages 17154-17164Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta03809j
Keywords
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Funding
- Priority Research Center Program [NRF-2011-0031392]
- Basic Science Research Program [NRF-2009-0083540]
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We report the syntheses of ternary nanoparticles (NPs) of Fe-x@(PtRu)((1-x)/2) (x = 0.0, 0.30, 0.34, 0.38, and 0.44) with Fe cores and PtRu alloy shells, which exhibit greatly improved electrocatalytic properties for the methanol oxidation reaction (MOR). The syntheses were achieved by one-step sonochemical treatments of Pt(acac)(2), Ru(acac)(3), and Fe(acac)(3) in ethylene glycol. The NPs are characterized by X-ray diffractometry, transmission electron microscopy (TEM), and inductively coupled plasma-adsorption emission spectroscopy for the particle size, morphology, and composition, respectively. The formation of core-shell NPs has been proven by scanning TEM-energy dispersive X-ray spectroscopy, and the electronic structures of the elements have been investigated by X-ray photoelectron spectroscopy and X-ray adsorption near edge spectroscopy. The ternary NPs show enhanced MOR electrocatalytic activity compared to a commercial PtRu-alloy (PtRu) by a factor of up to 2.5 based on the forward current density data. More importantly, the ternary NPs show complete suppression of CO-poisoning. Chronoamperometry data for MOR on the ternary NPs show improved stability over Pt/C and PtRu references.
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