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	Synthesis of Pd-Pt Bimetallic Nanocrystals with a Concave Structure through a Bromide-Induced Galvanic Replacement Reaction
	Zhang, Hui（Zhejiang Univ, State Key Lab Silicon Mat） ; Jin, Mingshang ; Wang, Jinguo（Univ Texas Dallas, Dept Mat Sci） ; Li, Weiyang（Washington Univ, Dept Biomed Engn） ; Camargo, Pedro H. C.（Washington Univ, Dept Biomed Engn） ; Kim, Moon J.（Univ Texas Dallas, Dept Mat Sci） ; Yang, Deren（Zhejiang Univ, State Key Lab Silicon Mat） ; Xie, Zhaoxiong ; Xie ZX(谢兆雄) ; Xia, Younan（Washington Univ, Dept Biomed Engn）
	2011-03-25
英文摘要	This article describes a systematic study of the galvanic replacement reaction between PtCl(6)(2-) ions and Pd nanocrystals with different shapes, including cubes, cuboctahedrons, and octahedrons. It was found that Br(-) ions played an important role in initiating, facilitating, and directing the replacement reaction. The presence of Br(-) ions led to the selective initiation of galvanic replacement from the {100} facets of Pd nanocrystals, likely due to the preferential adsorption of Br(-) ions on this crystallographic plane. The site-selective galvanic replacement resulted in the formation of Pd-Pt bimetallic nanocrystals with a concave structure owing to simultaneous dissolution of Pd atoms from the {100} facets and deposition of the resultant Pt atoms on the {111} facets. The Pd-Pt concave nanocubes with different weight percentages of Pt at 3.4, 10.4, 19.9, and 34.4 were also evaluated as electrocatalysts for the oxygen reduction reaction (ORR). Significantly, the sample with a 3.4 wt.% of Pt exhibited the largest specific electrochemical surface area and was found to be four times as active as the commercial Pt/C catalyst for the ORR in terms of equivalent Pt mass.; NSF[DMR-0804088, ECS-0335765]; University of Delaware[DE-FG02-03 ER15468]; Washington University in St. Louis; Zhejiang University; CNMT under MEST, Korea[2010K000336]
语种	英语
出版者	AMER CHEMICAL SOC
内容类型	期刊论文
源URL	[http://dx.doi.org/doi:10.1021/ja201156s]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Zhang, Hui,Jin, Mingshang,Wang, Jinguo,et al. Synthesis of Pd-Pt Bimetallic Nanocrystals with a Concave Structure through a Bromide-Induced Galvanic Replacement Reaction[J],2011.
APA	Zhang, Hui.,Jin, Mingshang.,Wang, Jinguo.,Li, Weiyang.,Camargo, Pedro H. C..,...&Xia, Younan.(2011).Synthesis of Pd-Pt Bimetallic Nanocrystals with a Concave Structure through a Bromide-Induced Galvanic Replacement Reaction..
MLA	Zhang, Hui,et al."Synthesis of Pd-Pt Bimetallic Nanocrystals with a Concave Structure through a Bromide-Induced Galvanic Replacement Reaction".(2011).

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