Enhanced Catalytic Activity of Pt Nanomaterials: From Monodisperse Nanoparticles to Self-Organized Nanoparticle-Linked Nanowires
Enhanced Catalytic Activity of Pt Nanomaterials: From Monodisperse Nanoparticles to Self-Organized Nanoparticle-Linked Nanowires
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DOI：
10.1021/jp910864w
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发表时间：
2010-03
影响因子：
3.7
通讯作者：
G. Qin;W. Pei;Xiumei Ma;Xiaoning Xu;Yuping Ren;Wei Sun;L. Zuo
中科院分区：
文献类型：
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作者：
G. Qin;W. Pei;Xiumei Ma;Xiaoning Xu;Yuping Ren;Wei Sun;L. Zuo
过去几年，影响单分散纳米粒子（NP）催化活性（CA）的因素，包括尺寸、结晶度、形状和高指数面，已得到充分研究。在这里，我们报告说，当使用两种模型催化反应（还原硝基苯酚或铁氰化钾）将单分散 Pt 近球形纳米粒子交联成 Pt 纳米线（NW）时，CA 显着增加。在这项工作中，在室温下使用葡萄糖作为表面活性剂和硼氢化钠作为还原剂在水溶液中制备了单分散的Pt NPs或NWs。通过简单地控制硼氢化钠与铂盐的摩尔比[NaBH4]/[Pt4+]即可获得单分散Pt NP或Pt NW。在上述催化反应中使用不同类型的 Pt NP 或 NW 胶体作为催化剂。结果表明，随着单分散 Pt NP 粒径的增加，催化反应的归一化速率常数略有增加，但它们急剧增加...
The factors affecting the catalytic activity (CA) of monodisperse nanoparticles (NPs), including size, crystallinity, shape, and high indexed facets, have been well-studied these past years; here, we report that the CA is significantly increased when monodisperse Pt near-spherical NPs are cross-linked into Pt nanowires (NWs) using two model catalytic reactions, reduction of either nitrophenol or potassium ferricyanide. In this work, monodisperse Pt NPs or NWs were prepared by using glucose as a surfactant and sodium borohydride as a reducing agent in aqueous solution at room temperature. Monodisperse Pt NPs or Pt NWs can be obtained by simply controlling the molar ratio, R, of the sodium borohydride to the platinum salt, [NaBH4]/[Pt4+]. Different types of Pt NP or NW colloids were used as catalysts in the catalytic reactions above. The results showed that the normalized rate constants of the catalytic reactions increase mildly with increasing particle size for the monodisperse Pt NPs, but they drastically...