Volume 132, Issue 20 pp. 7931-7937
Forschungsartikel

General Strategy for Synthesis of Ordered Pt3M Intermetallics with Ultrasmall Particle Size

Bentian Zhang

Bentian Zhang

The Key Laboratory of Fuel Cell Technology of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510641 China

These authors contributed equally to this work.

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Dr. Gengtao Fu

Corresponding Author

Dr. Gengtao Fu

Materials Science and Engineering Program & Texas Materials Institute, The University of Texas at Austin, Austin, Texas, USA

These authors contributed equally to this work.

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Dr. Yutao Li

Dr. Yutao Li

Materials Science and Engineering Program & Texas Materials Institute, The University of Texas at Austin, Austin, Texas, USA

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Lecheng Liang

Lecheng Liang

The Key Laboratory of Fuel Cell Technology of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510641 China

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Nicholas S. Grundish

Nicholas S. Grundish

Materials Science and Engineering Program & Texas Materials Institute, The University of Texas at Austin, Austin, Texas, USA

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Prof. Yawen Tang

Prof. Yawen Tang

School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023 China

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Prof. John B. Goodenough

Corresponding Author

Prof. John B. Goodenough

Materials Science and Engineering Program & Texas Materials Institute, The University of Texas at Austin, Austin, Texas, USA

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Prof. Zhiming Cui

Corresponding Author

Prof. Zhiming Cui

The Key Laboratory of Fuel Cell Technology of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510641 China

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First published: 05 February 2020
Citations: 20

Abstract

Controllable synthesis of atomically ordered intermetallic nanoparticles (NPs) is crucial to obtain superior electrocatalytic performance for fuel cell reactions, but still remains arduous. Herein, we demonstrate a novel and general hydrogel-freeze drying strategy for the synthesis of reduced graphene oxide (rGO) supported Pt3M (M=Mn, Cr, Fe, Co, etc.) intermetallic NPs (Pt3M/rGO-HF) with ultrasmall particle size (about 3 nm) and dramatic monodispersity. The formation of hydrogel prevents the aggregation of graphene oxide and significantly promotes their excellent dispersion, while a freeze-drying can retain the hydrogel derived three-dimensionally (3D) porous structure and immobilize the metal precursors with defined atomic ratio on GO support during solvent sublimation, which is not afforded by traditional oven drying. The subsequent annealing process produces rGO supported ultrasmall ordered Pt3M intermetallic NPs (≈3 nm) due to confinement effect of 3D porous structure. Such Pt3M intermetallic NPs exhibit the smallest particle size among the reported ordered Pt-based intermetallic catalysts. A detailed study of the synthesis of ordered intermetallic Pt3Mn/rGO catalyst is provided as an example of a generally applicable method. This study provides an economical and scalable route for the controlled synthesis of Pt-based intermetallic catalysts, which can pave a way for the commercialization of fuel cell technologies.

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