NDLI: Shaped Pt-Ni nanocrystals with an ultrathin Pt-enriched shell derived from one-pot hydrothermal synthesis as active electrocatalysts for oxygen reduction

Content Provider	Springer Nature Link
Author	Gu, Jun Lan, Guangxu Jiang, Yingying Xu, Yanshuang Zhu, Wei Jin, Chuanhong Zhang, Yawen
Copyright Year	2014
Abstract	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 Pt$_{50}$Ni$_{50}$ 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.
Starting Page	1480
Ending Page	1496
Page Count	17
File Format	PDF
ISSN	19980124
Journal	Nano Research
Volume Number	8
Issue Number	5
e-ISSN	19980000
Language	English
Publisher	Tsinghua University Press
Publisher Date	2014-12-01
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Pt-NiPt-Ni alloy nanocrystals bimetallic catalysts oxygen reduction reaction dealloying aqueous-phase synthesis Nanotechnology Materials Science Atomic/Molecular Structure and Spectra Condensed Matter Physics Biotechnology Biomedicine general
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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