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

CORC > 北京大学 > 化学与分子工程学院

	Shaped Pt-Ni nanocrystals with an ultrathin Pt-enriched shell derived from one-pot hydrothermal synthesis as active electrocatalysts for oxygen reduction
	Gu, Jun ; Lan, Guangxu ; Jiang, Yingying ; Xu, Yanshuang ; Zhu, Wei ; Jin, Chuanhong ; Zhang, Yawen
刊名	NANO RESEARCH
	2015
关键词	Pt-NiPt-Ni alloy nanocrystals bimetallic catalysts oxygen reduction reaction dealloying aqueous-phase synthesis FUEL-CELL CATALYSTS PTXNI1-X NANOPARTICLES ELECTRONIC-STRUCTURE ALLOY NANOPARTICLES COLLOIDAL SYNTHESIS TUNABLE COMPOSITION FEPT NANOPARTICLES SKIN SURFACES PLATINUM PD
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.; supported by the National Natural Science Foundation of China,Y. W. Z. particularly appreciates the financial aid from the China National Funds for Distinguished Young Scientists from the National Natural Science Foundation of China (NSFC),partly carried out in the Center of Electron Microscopy of Zhejiang University,which was financially supported by the National Natural Science Foundation of China,the National Basic Research Program of China,the Program for Innovative Research Teams in Universities of Ministry of Education of China,the Fundamental Research Funds for the Central Universities; SCI(E); 中国科学引文数据库(CSCD); ARTICLE; ywzhang@pku.edu.cn; 5; 1480-1496; 8
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/420351]
专题	化学与分子工程学院
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.
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.
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 (2015).