期刊
NANO LETTERS
卷 16, 期 2, 页码 1467-1471出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b05140
关键词
Platinum-based catalyst; icosahedral nanocage; multiply twinned structure; oxygen reduction reaction
类别
资金
- Georgia Institute of Technology
- NSF [CHE 1505441]
- China Scholarship Council
- Arizona State University
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1505441] Funding Source: National Science Foundation
Engineering the surface structure of noble-metal nanocrystals offers an effective route to the development of catalysts or electrocatalysts with greatly enhanced activity. Here, we report the synthesis of Pt-based icosahedral nanocages whose surface is enclosed by both {111} facets and twin boundaries while the wall thickness can be made as thin as six atomic layers. The nanocages are derived from Pd@Pt-4.5L, icosahedra by selectively etching away the Pd in the core. During etching, the multiply twinned structure can be fully retained whereas the Pt atoms in the wall reconstruct to eliminate the corrugated structure built in the original Pt shell. The Pt-based icosahedral nanocages show a specific activity of 3.50 mA cm(-2) toward the oxygen reduction reaction, much greater than those of the Pt-based octahedral nanocages (1.98 mA cm(-2)) and a state-of-the-art commercial Pt/C catalyst (0.35 mA cm(-2)). After 5000 cycles of accelerated durability test, the mass activity of the Pt-based icosahedral nanocages drops from 1.28 to 0.76 A mg(P nu)(-1) which is still about four times greater than that of the original Pt/C catalyst (0.19 A mg(Pt)(-1)).
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