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Science  24 July 2015:
Vol. 349 no. 6246 pp. 412-416
DOI: 10.1126/science.aab0801
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Platinum-based nanocages with subnanometer-thick walls and well-defined, controllable facets
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Lei Zhang1,2, Luke T. Roling3, Xue Wang1,2, Madeline Vara4, Miaofang Chi5, Jingyue Liu6, Sang-Il Choi1, Jinho Park4, Jeffrey A. Herron3, Zhaoxiong Xie2, Manos Mavrikakis3, Younan Xia1,4,7,*
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A cost-effective catalyst should have a high dispersion of the active atoms, together with a controllable surface structure for the optimization of activity, selectivity, or both. We fabricated nanocages by depositing a few atomic layers of platinum (Pt) as conformal shells on palladium (Pd) nanocrystals with well-defined facets and then etching away the Pd templates. Density functional theory calculations suggest that the etching is initiated via a mechanism that involves the formation of vacancies through the removal of Pd atoms incorporated into the outermost layer during the deposition of Pt. With the use of Pd nanoscale cubes and octahedra as templates, we obtained Pt cubic and octahedral nanocages enclosed by {100} and {111} facets, respectively, which exhibited distinctive catalytic activities toward oxygen reduction.ÏÄÓ×ÄÐ×îÐÂscienceÖØ°õ´ó×÷¡ª¡ª¾ßÓÐÑÇÄÉÃ׺ñ¿ÇÇҿɿؾ§ÃæµÄ²¬¿ÕÐÄÄÉÃ×ÀÎÁý
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