Research Article

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2015, 8(1): 271–280

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https://doi.org/10.1007/s12274-014-0664-z

Core@shell sub-ten-nanometer noble metal nanoparticles with a controllable thin Pt shell and their catalytic activity towards oxygen reduction

Ntirikwendera Deogratias1, Muwei Ji1, Yong Zhang1, Jiajia Liu1, Jiatao Zhang1,2 (*), and Hesun Zhu1

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1 Research Center of Materials Science, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China
2 Department of Materials Physics and Chemistry, Beijing Institute of Technology, Beijing, 100081, China

Keywords: core@shell, metal nanocomposites, Pt shell, sub-ten-nanometer, oxygen reduction
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Reducing Pt loading, while improving electrocatalytic activity and the stability of Pt-based nanostructured materials, is currently a key challenge in green energy technology. Herein, we report the controllable synthesis of tri-metallic (Au@Ag@Pt) and bimetallic (Ag@Pt) particles consisting of a controllable thin Pt shell, via interface-mediated galvanic displacement. Through oil-ethanol-H2O interface mediation, the controllable “out to in” displacement of Ag atoms to Pt enables the formation of a thin Pt shell on monodisperse sub-ten-nanometer Au@Ag and Ag nanocrystals. The synthesized nanoparticles with a thin Pt shell exhibited potential catalytic activity towards the oxygen reduction reaction (ORR) due to the high exposure of Pt atoms.
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Core@shell sub-ten-nanometer noble metal nanoparticles with a controllable thin Pt shell and their catalytic activity towards oxygen reduction. Nano Res. 2015, 8(1): 271–280 https://doi.org/10.1007/s12274-014-0664-z

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