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Science 4 May 2007:
Vol. 316. no. 5825, pp. 732 - 735
DOI: 10.1126/science.1140484
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Reports

Synthesis of Tetrahexahedral Platinum Nanocrystals with High-Index Facets and High Electro-Oxidation Activity

Na 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.

1 State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
2 School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332–0245, USA.

* To whom correspondence should be addressed. E-mail: sgsun{at}xmu.edu.cn (S.G.S.); zhong.wang{at}mse.gatech.edu (Z.L.W.)

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