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Core/Shell Face-Centered Tetragonal FePd/Pd Nanoparticles as an Efficient Non-Pt Catalyst for the Oxygen Reduction Reaction.

Core/Shell Face-Centered Tetragonal FePd/Pd Nanoparticles as an Efficient Non-Pt Catalyst for the Oxygen Reduction Reaction.

ACS nano (2015-10-06)

Guangming Jiang, Huiyuan Zhu, Xu Zhang, Bo Shen, Liheng Wu, Sen Zhang, Gang Lu, Zhongbiao Wu, Shouheng Sun

ABSTRACT

We report the synthesis of core/shell face-centered tetragonal (fct)-FePd/Pd nanoparticles (NPs) via reductive annealing of core/shell Pd/Fe3O4 NPs followed by temperature-controlled Fe etching in acetic acid. Among three different kinds of core/shell FePd/Pd NPs studied (FePd core at ∼8 nm and Pd shell at 0.27, 0.65, or 0.81 nm), the fct-FePd/Pd-0.65 NPs are the most efficient catalyst for the oxygen reduction reaction (ORR) in 0.1 M HClO4 with Pt-like activity and durability. This enhanced ORR catalysis arises from the desired Pd lattice compression in the 0.65 nm Pd shell induced by the fct-FePd core. Our study offers a general approach to enhance Pd catalysis in acid for ORR.

MATERIALS

Product Number

Brand

Product Description

Sigma-Aldrich

Acetic acid, glacial, ACS reagent, ≥99.7%

Sigma-Aldrich

Acetic acid, glacial, ReagentPlus^®, ≥99%

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Acetic acid solution, suitable for HPLC

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Supelco

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2-Propanol, electronic grade, 99.999% trace metals basis

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2-Propanol, Laboratory Reagent, ≥99.5%

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Hexane, Laboratory Reagent, ≥95%

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SAFC

Oleylamine, ≥98% (primary amine)