Synthesis of tetrahexahedral platinum nanocrystals with high-index facets and high electro-oxidation activity
Synthesis of tetrahexahedral platinum nanocrystals with high-index facets and high electro-oxidation activity
复制标题
具有高折射率晶面和高电氧化活性的四六面体铂纳米晶的合成
DOI：
10.1126/science.1140484
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发表时间：
2007-05-04
期刊：
影响因子：
56.9
通讯作者：
Wang, Zhong Lin
中科院分区：
文献类型：
--
作者：
Tian, Na;Zhou, Zhi-You;Wang, Zhong Lin
贵金属纳米晶体（NC）的形状通常由{111}和{100}面包围的多面体限定，例如立方体、四面体和八面体。通过方波电位电化学处理载于玻碳上的铂纳米球，以高产率制备了不寻常的四面体（THH）形状的铂纳米碳。单晶THH NC被24个高折射率小面包围，例如具有大密度的原子台阶和悬挂键的{730}、{210}和/或{520}表面。这些高能表面在热（至800°C）和化学上都是稳定的，并且对于小的有机燃料（如甲酸和乙醇）的电氧化，对于等效的Pt表面积，表现出大大增强的（高达400%）催化活性。
The shapes of noble metal nanocrystals (NCs) are usually defined by polyhedra that are enclosed by {111} and {100} facets, such as cubes, tetrahedra, and octahedra. Platinum NCs of unusual tetrahexahedral (THH) shape were prepared at high yield by an electrochemical treatment of Pt nanospheres supported on glassy carbon by a square-wave potential. The single-crystal THH NC is enclosed by 24 high-index facets such as {730}, {210}, and/or {520} surfaces that have a large density of atomic steps and dangling bonds. These high-energy surfaces are stable thermally (to 800°C) and chemically and exhibit much enhanced (up to 400%) catalytic activity for equivalent Pt surface areas for electro-oxidation of small organic fuels such as formic acid and ethanol.