Crystalline Facet-Directed Generation Engineering of Ultrathin Platinum Nanodendrites
Crystalline Facet-Directed Generation Engineering of Ultrathin Platinum Nanodendrites
复制标题
超薄铂纳米枝晶的晶面定向生成工程
DOI：
10.1021/acs.jpclett.8b03861
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发表时间：
2019
影响因子：
5.7
通讯作者：
Liu Ben
中科院分区：
文献类型：
--
作者：
Xu Dongdong;Lv Hao;Jin Haibao;Liu Ying;Ma Yanhang;Han Min;Bao Jianchun;Liu Ben
在这项工作中，我们成功地制备了二维的单晶铂纳米枝晶（PtND）与精确控制的代（大小）通过表面活性剂定向溶液相合成。两亲性表面活性剂C22 H45-N+（CH 3）2CH 2COOH（Br-）同时作为结构导向模板剂和小面覆盖剂，以动力学工程师沿沿着选择性暴露的{111}小面在平面内外延生长Pt纳米晶体，从而形成双晶PtND。一种新的形成机制定义为晶面定向逐步在平面内外延生长，类似于有机树枝状大分子的合成，提出的纳米结构和结晶演化的PtND的基础上。世代生长过程易于扩展以精确地设计PtND的世代（从0到25），并且还可以用于生长其他贵金属ND（例如，PdND和AuND）和核-壳Pt-Pd ND。由于结构上的优势，PtNDs对析氢反应表现出更强的电催化性能。
In this work, we successfully prepare two-dimensional ultrathin single-crystalline platinum nanodendrites (PtNDs) with precisely controlled generation (size) through a surfactant-directed solution-phase synthesis. The amphiphilic surfactant of C22H45–N+(CH3)2CH2COOH (Br–) acts as the structure-directing template and facet-capping agent simultaneously to kinetically engineer in-the-plane epitaxial growth of Pt nanocrystals along selectively exposed {111} facets into ultrathin PtNDs. A novel formation mechanism defined as crystalline facet-directed step-by-step in-the-plane epitaxial growth, similar to the synthesis of organic dendrimers, is proposed on the basis of the nanostructure and crystalline evolution of PtNDs. The generation growth process is readily extended to precisely engineer the generation of PtNDs (from 0 to 25) and can also be utilized to grow other noble metal NDs (e.g., PdNDs and AuNDs) and core–shell Pt–Pd NDs. Because of the structural advantages, ultrathin PtNDs exhibit enhanced electrocatalytic performance toward hydrogen evolution reaction.