Synthesis and structural characterization of a highly ordered mesoporous Pt-Ru alloy via "evaporation-mediated direct templating"
Synthesis and structural characterization of a highly ordered mesoporous Pt-Ru alloy via "evaporation-mediated direct templating"
复制标题
DOI：
10.1021/cm062539n
复制
发表时间：
2007-02
影响因子：
8.6
通讯作者：
Y. Yamauchi;T. Ohsuna;K. Kuroda
中科院分区：
文献类型：
--
作者：
Y. Yamauchi;T. Ohsuna;K. Kuroda
将表面活性剂稀释后，在导电衬底上浇铸一层溶致液晶（LLC）膜，制备出高度有序的二维六方介孔Pt - Ru合金颗粒。采用高分辨率扫描电镜（HR-SEM）、透射电镜（TEM）、能量色散x射线能谱（EDS）和x射线光电子能谱（XPS）测定合金的状态。扫描电镜（HR-SEM）图像显示，多孔纳米结构覆盖了每个颗粒外表面的整个区域。透射电镜（TEM）图像表明，孔壁是由直径约为3 nm的纳米颗粒组成，其晶格条纹是随机取向的。能谱图显示，Pt和Ru元素在孔壁上分布良好。从XPS数据来看，合金中的Ru原子基本上处于零价金属态Ru(0)。Th……
Highly ordered 2D-hexagonal mesoporous Pt−Ru alloy particles were deposited by an electrochemical process after a lyotropic liquid crystalline (LLC) film including both Pt and Ru species was prepared on a conductive substrate from a diluted surfactant solution by casting. We have determined the alloy state by using high-resolution scanning electron microscopy (HR-SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopic (EDS) mapping, and X-ray photoelectron spectroscopy (XPS). The HR-SEM images show that the porous nanostructures are formed over the entire area on the external surface of each particle. The TEM images prove that the pore wall is composed of connected nanoparticles of ca. 3 nm in size and that the lattice fringes assigned to a fcc structure are randomly oriented. The EDS mapping shows both elements of Pt and Ru are well distributed within the pore wall. From the XPS data, Ru atoms in the alloy are thought to basically be in the zerovalent metallic state, Ru(0). Th...