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J. Am. Chem.Soc. 2012, 134, 2236−2245 Ordered Mesoporous Platinum@Graphitic Carbon Embedded Nanophase as a Highly Active, Stable, and Methanol-Tolerant Oxygen Reduction Electrocatalyst Zhangxiong Wu,Yingying Lv,Yongyao Xia,Paul A. Webley,and Dongyuan Zhao* Department of Chemical Engineering, Faculty of Engineering, Monash University, Melbourne, VIC 3800, Australia Department of Chemistry and Laboratory of Advanced Materials, Fudan University, Shanghai 200433, P. R. China Highly ordered mesoporous platinum@graphitic carbon (Pt@ GC) composites with well-graphitized carbon frameworks and uniformly dispersed Pt nanoparticles embedded within the carbon pore walls have been rationally designed and synthesized. In this facile method, ordered mesoporous silica impregnated with a variable amount of Pt precursor is adopted as the hard template, followed by carbon deposition through a chemical vapor deposition (CVD) process with methane as a carbon precursor. During the CVD process, in situ reduction of Pt precursor, deposition of carbon, and graphitization can be integrated into a single step. The mesostructure, porosity and Pt content in the final mesoporous Pt@GC composites can be conveniently adjusted over a wide range by controlling the initial loading amount of Pt precursor and the CVD temperature and duration. The integration of high surface area, regular mesopores, graphitic nature of the carbon walls as well as highly dispersed and spatially embedded Pt nanoparticles in the mesoporous Pt@GC composites make them excellent as highly active, extremely stable, and methanol-tolerant electrocatalysts toward the oxygen reduction reaction (ORR). A systematic study by comparing the ORR performance among several carbon supported Pt electrocatalysts suggests the overwhelmingly better performance of the mesoporous Pt@GC composites. The structural, textural, and framework properties of the mesoporous Pt@GC composites are extensively studied and strongly related to their excellent ORR performance. These materials are highly promising for fuel cell applications and the synthesis method is quite a plicable for constructing mesoporous graphitized carbon materials with various embedded nanophases. Ò»»á¾Í½²½âÕâÆªÎÄÏ×£¬ÓÐÐËȤµÄ¿ÉÒÔÏÈÏÂÔØ¿´¿´[ Last edited by seagrove on 2012-3-29 at 12:35 ] |
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