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SCIENCE新文: Nanoframes with Three-Dimensional Electrocatalytic Surfaces
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杨培栋新文：Highly Crystalline Multimetallic Nanoframes with Three-Dimensional Electrocatalytic Surfaces Control of structure at the atomic level can precisely and effectively tune catalytic properties of materials, enabling enhancement in both activity and durability. We synthesized a highly active and durable class of electrocatalysts by exploiting the structural evolution of platinum-nickel (Pt-Ni) bimetallic nanocrystals. The starting material, crystalline PtNi 3 polyhedra, transforms in solution by interior erosion into Pt 3 Ni nanoframes with surfaces that offer three-dimensional molecular accessibility. The edges of the Pt-rich PtNi 3 polyhedra are maintained in the final Pt 3 Ni nanoframes. Both the interior and exterior catalytic surfaces of this open-framework structure are composed of the nanosegregated Pt-skin structure, which exhibits enhanced oxygen reduction reaction (ORR) activity. The Pt 3 Ni nanoframe catalysts achieved a factor of 36 enhancement in mass activity and a factor of 22 enhancement in specific activity, respectively, for this reaction (relative to state-of-the-art platinum-carbon catalysts) during prolonged exposure to reaction conditions.  1.jpg  2.jpg |
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2014-03-23 15:21:23, 1.96 M
2014-03-23 15:21:52, 4.79 M
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52楼2014-07-25 18:22:19
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沙中木2楼
2014-03-23 20:23
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五星好评 顶一下，感谢分享！
yixsm4楼
2014-03-24 08:51
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2014-03-24 12:27
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2014-03-25 01:07
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2014-03-26 09:43
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2014-03-26 12:07
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2014-03-26 13:19
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2014-03-26 13:55
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2014-03-26 23:05
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2014-03-27 07:56
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2014-03-27 13:42
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