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chl5063木虫 (著名写手)
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王中林研究小组在Science上最新一期发表的研究成果
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Science 4 May 2007: Vol. 316. no. 5825, pp. 732 - 735 DOI: 10.1126/science.1140484 Synthesis of Tetrahexahedral Platinum Nanocrystals with High-Index Facets and High Electro-Oxidation ActivityNa Tian,1 Zhi-You Zhou,1 Shi-Gang Sun,1* Yong Ding,2 Zhong Lin Wang2* The shapes of noble metal nanocrystals (NCs) are usually defined by polyhedra that are enclosed by {111} and {100} facets, such as cubes, tetrahedra, and octahedra. Platinum NCs of unusual tetrahexahedral (THH) shape were prepared at high yield by an electrochemical treatment of Pt nanospheres supported on glassy carbon by a square-wave potential. The single-crystal THH NC is enclosed by 24 high-index facets such as {730}, {210}, and/or {520} surfaces that have a large density of atomic steps and dangling bonds. These high-energy surfaces are stable thermally (to 800°C) and chemically and exhibit much enhanced (up to 400%) catalytic activity for equivalent Pt surface areas for electro-oxidation of small organic fuels such as formic acid and ethanol. |
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2楼2007-05-05 09:50:56