Journal ArticleDOI
Synthesis of Pd−Pt Bimetallic Nanocrystals with a Concave Structure through a Bromide-Induced Galvanic Replacement Reaction
Hui Zhang,Mingshang Jin,Mingshang Jin,Jinguo Wang,Weiyang Li,Pedro H. C. Camargo,Moon J. Kim,Deren Yang,Zhaoxiong Xie,Younan Xia +9 more
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TLDR
It was found that Br(-) ions played an important role in initiating, facilitating, and directing the replacement reaction, and the site-selective galvanic replacement resulted in the formation of Pd-Pt bimetallic nanocrystals with a concave structure.Abstract:
This article describes a systematic study of the galvanic replacement reaction between PtCl62− 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 lar...read more
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Recent Advances in Electrocatalysts for Oxygen Reduction Reaction
TL;DR: This comprehensive Review focuses on the low- and non-platinum electrocatalysts including advanced platinum alloys, core-shell structures, palladium-based catalysts, metal oxides and chalcogenides, carbon-based non-noble metal catalysts and metal-free catalysts.
Journal ArticleDOI
Sub-nanometre sized metal clusters: from synthetic challenges to the unique property discoveries
Yizhong Lu,Wei Chen +1 more
TL;DR: In this critical review, recent advances in sub-nanometre sized metal clusters (Au, Ag, Cu, etc.) including the synthetic techniques, structural characterizations, novel physical, chemical and optical properties and their potential applications are discussed in detail.
Journal ArticleDOI
25th Anniversary Article: Galvanic Replacement: A Simple and Versatile Route to Hollow Nanostructures with Tunable and Well-Controlled Properties
TL;DR: A progress report on the use of galvanic replacement for generating complex hollow nanostructures with tunable and well-controlled properties and its capability to fabricate nanomaterials with complex structures and/or compositions by coupling with other processes such as co-reduction and the Kirkendall effect.
Journal ArticleDOI
Templated synthesis of nanostructured materials
TL;DR: The use of both physical and chemical hard colloidal templates, soft templates, and other non-colloidal templates are examined, followed by the perspective on the state of the field and potential future directions.
Journal ArticleDOI
FePt nanoparticles assembled on graphene as enhanced catalyst for oxygen reduction reaction.
Shaojun Guo,Shouheng Sun +1 more
TL;DR: G is indeed a promising support to improve NP activity and durability for practical catalytic applications, and is demonstrated to be much more stable in the ORR condition and showed nearly no activity change after 10 000 potential sweeps.
References
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Journal ArticleDOI
Pd-Pt Bimetallic Nanodendrites with High Activity for Oxygen Reduction
Byungkwon Lim,Majiong Jiang,Pedro H. C. Camargo,Eun Chul Cho,Jing Tao,Xianmao Lu,Yimei Zhu,Younan Xia +7 more
TL;DR: Pd-Pt bimetallic nanodendrites consisting of a dense array of Pt branches on a Pd core by reducing K2PtCl4 with L-ascorbic acid in the presence of uniform Pd nanocrystal seeds in an aqueous solution showed relatively large surface areas and particularly active facets toward the oxygen reduction reaction (ORR), the rate-determining step in a proton-exchange membrane fuel cell.
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Shape Control of Colloidal Metal Nanocrystals
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