期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 133, 期 15, 页码 6078-6089出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja201156s
关键词
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资金
- NSF [DMR-0804088, ECS-0335765]
- University of Delaware [DE-FG02-03 ER15468]
- Washington University in St. Louis
- Zhejiang University
- CNMT under MEST, Korea [2010K000336]
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 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.
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