期刊
NANO RESEARCH
卷 8, 期 5, 页码 1480-1496出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-014-0632-7
关键词
Pt-NiPt-Ni alloy nanocrystals; bimetallic catalysts; oxygen reduction reaction; dealloying; aqueous-phase synthesis
类别
资金
- National Natural Science Foundation of China [21025101, 21271011, 21321001, 51222202]
- National Natural Science Foundation of China (NSFC)
- National Basic Research Program of China [2014CB932500]
- Ministry of Education of China [IRT13037]
- Fundamental Research Funds for the Central Universities [2014XZZX003-07]
Alloy nanocrystals (NCs) of Pt with 3d transition metals, especially Ni, are excellent catalysts for the oxygen reduction reaction (ORR). In this work, we, for the first time, demonstrated the water phase colloidal synthesis of Pt-M (M = Ni, Co and Fe) alloy NCs with tunable composition and morphology through a facile hydrothermal method. Pt-Ni alloy NCs synthesized with this method presented better ORR activity than commercial Pt/C catalysts. The X-ray energy dispersive spectra (EDS) mapping technique revealed that Pt-enriched shells existed on the as-synthesized Pt-Ni alloy NCs. About two atom thick layered Pt-enriched shells formed on Pt50Ni50 NCs and the thickness of the Pt-enriched shells increased as the Ni content increased. Furthermore, X-ray photoelectron spectroscopy analysis revealed that the oxidation level of the surface Pt atoms on the Pt-Ni alloy NCs decreased compared with monometallic Pt NCs, implying a decrease in the oxophilicity of the surface Pt atoms. Pt-Ni alloy NCs with lower oxophilicity of the surface Pt atoms give higher ORR activity. The most active alloy sample showed 13 times higher specific activity and six times higher mass activity at 0.9 V vs. a reversible hydrogen electrode when compared with commercial Pt/C. Pt-Ni alloy NCs also showed better durability than commercial Pt/C in long term ORR tests.
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