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Ni-Pd core-shell nanoparticles with Pt-like oxygen reduction electrocatalytic performance in both acidic and alkaline electrolytes

Abstract

Fabrication of non-Pt high-performance oxygen reduction reaction (ORR) catalysts is essential for the application of fuel cells. In this work, monodispersed bimetallic Ni-Pd core-shell nanoparticles (NPs) with tunable shell composition and content were synthesized by using a modified one-pot colloidal approach and characterized. Also, the core shell structure-dependence of their ORR performance without the interruption of intermetallic phase was explored. The core-shell structured catalysts (Ni@Pd3/C NPs) exhibited a robust ORR activity and stability with a high onset potential of 0.99 V, a half-wave potential of 0.87 V and an average electron transfer number of 3.91 in 0.1 M HClO4. Furthermore, a high onset potential of 0.98 V, a half-wave potential of 0.86 V and an average electron transfer number of 3.98 were achieved in 0.1 M KOH. These results are comparable to those of the commercially available Pt/C catalysts. Moreover, the catalysts also maintained a good long-term cycling stability in both acidic and alkaline electrolytes. Thus, this work demonstrates that the ORR performance of the Ni-Pd alloy could be boosted through constructing the core-shell structure with the Pd-enriched surface and the Ni-Pd model alloy could be further applied to assess the role of the Pd-based core-shell structure in other electrochemical catalytic reactions.

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Publication details

The article was received on 26 Feb 2017, accepted on 08 Apr 2017 and first published on 10 Apr 2017


Article type: Paper
DOI: 10.1039/C7TA01754E
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Ni-Pd core-shell nanoparticles with Pt-like oxygen reduction electrocatalytic performance in both acidic and alkaline electrolytes

    J. Jiang, H. Gao, S. Lu, X. Zhang, C. Wang, W. Wang and H. Yu, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA01754E

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