24小时热门版块排行榜

返回列表

【奖励】本帖被评价48次，作者hejin04c增加金币 38.4 个

本帖产生 1 个 ECEPI ，点击这里进行查看

当前只显示满足指定条件的回帖，点击这里查看本话题的所有回帖

hejin04c

荣誉版主 (著名写手)

[资源] 3.21文献解读：Ordered Mesoporous Platinum@Graphitic Carbon Embedded Nanophase已有1人参与

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 ]

回复此楼