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

doi:10.1007/s12274-014-0632-7

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	Shaped Pt-Ni nanocrystals with an ultrathin Pt-enriched shell derived from one-pot hydrothermal synthesis as active electrocatalysts for oxygen reduction
	Gu, Jun 1; Lan, Guangxu 1; Jiang, Yingying 2,3; Xu, Yanshuang 1; Zhu, Wei 1; Jin, Chuanhong 2,3; Zhang, Yawen 1
刊名	NANO RESEARCH
	2015-05-01
卷号	8 期号:5 页码:1480-1496
关键词	Pt-nipt-ni Alloy Nanocrystals Bimetallic Catalysts Oxygen Reduction Reaction Dealloying Aqueous-phase Synthesis
ISSN号	1998-0124
DOI	10.1007/s12274-014-0632-7
英文摘要	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.
语种	英语
出版者	TSINGHUA UNIV PRESS
WOS记录号	WOS:000354625600006
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/43579]
专题	中国科学院化学研究所
通讯作者	Zhang, Yawen
作者单位	1.Peking Univ, State Key Lab Rare Earth Mat Chem & Applicat, PKU HKU Joint Lab Rare Earth Mat & Bioinorgan Che, Beijing Natl Lab Mol Sci,Coll Chem & Mol Engn, Beijing 100871, Peoples R China 2.Zhejiang Univ, Key Lab Adv Mat & Applicat Batteries Zhejiang Pro, State Key Lab Silicon Mat, Hangzhou 310027, Zhejiang, Peoples R China 3.Zhejiang Univ, Sch Mat Sci & Engn, Hangzhou 310027, Zhejiang, Peoples R China
推荐引用方式 GB/T 7714	Gu, Jun,Lan, Guangxu,Jiang, Yingying,et al. Shaped Pt-Ni nanocrystals with an ultrathin Pt-enriched shell derived from one-pot hydrothermal synthesis as active electrocatalysts for oxygen reduction[J]. NANO RESEARCH,2015,8(5):1480-1496.
APA	Gu, Jun.,Lan, Guangxu.,Jiang, Yingying.,Xu, Yanshuang.,Zhu, Wei.,...&Zhang, Yawen.(2015).Shaped Pt-Ni nanocrystals with an ultrathin Pt-enriched shell derived from one-pot hydrothermal synthesis as active electrocatalysts for oxygen reduction.NANO RESEARCH,8(5),1480-1496.
MLA	Gu, Jun,et al."Shaped Pt-Ni nanocrystals with an ultrathin Pt-enriched shell derived from one-pot hydrothermal synthesis as active electrocatalysts for oxygen reduction".NANO RESEARCH 8.5(2015):1480-1496.