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3.21文献解读：Ordered Mesoporous Platinum@Graphitic Carbon Embedded Nanophase已有1人参与
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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. 一会就讲解这篇文献，有兴趣的可以先下载看看[ Last edited by seagrove on 2012-3-29 at 12:35 ] |
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2012-03-21 12:47:09, 656.98 K
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4楼2012-03-21 13:48:11
hejin04c: 回帖置顶 2012-03-24 08:07:37
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拿到这篇文献，我们首先来看题目， Ordered Mesoporous Platinum@Graphitic Carbon Embedded Nanophase as a Highly Active, Stable, and Methanol-Tolerant Oxygen Reduction Electrocatalyst Platinum Graphitic Carbon @表示该材料是核壳式结构， 研究的主要是甲醇燃料电池，我们给出了一个定性的东西出来。 再看一下文献的作者， 是复旦大学的赵东元教授， 他主要做的就是新功能材料这一块，所以文章的心意主要在材料这一方面 [ Last edited by hejin04c on 2012-3-21 at 13:35 ] |
2楼2012-03-21 13:32:57
hejin04c: 回帖置顶 2012-03-24 08:07:40
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摘要第一句话：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. 交代了文章主要干了什么事情。主要是合成了一种核壳式的纳米材料，怎样的结构？uniformly dispersed Pt nanoparticles embedded within the carbon pore walls 说明是均匀分布的pt核，外面是多孔碳结构。 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. 这句话主要交代了使用什么方法合成的。用的是CVD化学气相沉积，而且是硬模板法 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.合成中的调控 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).材料的性能表征氧还原怎么样 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. 优异的性能源于结构，化学中结构决定性质These materials are highly promising for fuel cell applications and the synthesis method is quite a plicable for constructing esoporous graphitized carbon materials with various embedded nanophases.最后一句是研究的意义和展望 |
3楼2012-03-21 13:42:50
5楼2012-03-21 13:53:31
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crystal-fan11楼
2012-03-21 18:09
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五星好评 顶一下，感谢分享！
sunnyangel0213楼
2012-03-21 21:09
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五星好评 顶一下，感谢分享！
nanost14楼
2012-03-21 21:50
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五星好评 顶一下，感谢分享！