具有高指数晶面和高电氧化活性的四面体铂纳米晶体的合成
Synthesis of tetrahexahedral platinum nanocrystals with high-index facets and high electro-oxidation activity.
作者信息
Tian Na, Zhou Zhi-You, Sun Shi-Gang, Ding Yong, Wang Zhong Lin
机构信息
State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
出版信息
Science. 2007 May 4;316(5825):732-5. doi: 10.1126/science.1140484.
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 degrees 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.
贵金属纳米晶体（NCs）的形状通常由被{111}和{100}晶面包围的多面体定义，如立方体、四面体和八面体。通过对玻碳负载的铂纳米球进行方波电位电化学处理，高产率制备了具有不寻常四面体六面体（THH）形状的铂纳米晶体。单晶THH纳米晶体由24个高指数晶面包围，如{730}、{210}和/或{520}表面，这些表面具有高密度的原子台阶和悬空键。这些高能表面在热（至800摄氏度）和化学方面是稳定的，并且对于甲酸和乙醇等小有机燃料的电氧化，在等效铂表面积上表现出大大增强（高达400%）的催化活性。
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