Journal
ELECTROCHIMICA ACTA
Volume 192, Issue -, Pages 227-233Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.01.147
Keywords
Core-shell nanocyrstal; Nanocrystal synthesis; Oxygen reduction reaction; Fuel cell; Electro-catalyst
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Funding
- Natural Science Foundation of China [21303265]
- Ph.D. Programs Foundation of Ministry of Education of China [20130007120012]
- Young Talent Award of CUP [YJRC-2013-46]
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Core@shell nanocrystals (NCs) have been widely explored for oxygen reduction reaction (ORR). In this work, monodisperse PdCu@PtCu NCs with various shell thicknesses and compositions have been synthesized through a two-step protocol. As-synthesized PdCu@PtCu core@shell catalysts show enhanced specific activities (SAs) and mass activities (MAs) towards ORR. When PdCu/PtxCuy (core/shell) atomic ratio and Pt/Cu (x/y) ratio both reach 1/1, the core@shell catalyst exhibits the highest SA and MA (normalized with total mass of Pt and Pd). It is also found that the core@shell catalysts show drastically enhanced stability compared with pure PtCu alloy catalyst. It is proposed that both the activity and stability enhancements can be ascribed to the electronic interaction or charge transfer between Pd atoms (in core) and the shell elements. This work demonstrates a new family of core@shell catalysts that can be potentially used as cathode electro-catalysts in fuel cells. (C) 2016 Elsevier Ltd. All rights reserved.
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