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The three-dimensional morphology of nickel nanodots in amorphous silica and their role in high-temperature permselectivity for hydrogen separation

机译：无定形二氧化硅中镍纳米点的三维形态及其在高温全选择性氢分离中的作用

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摘要

We report the development of technologically important nickel (Ni) nanodots (nanoparticles) dispersed in amorphous silica (SiO_2) for high-temperature permselectivity for hydrogen separation membranes, crucial in hydrocarbon reactions and H_2 production, and present the systematic reconstruction of the three-dimensional (3D) structures of the nanodots using electron nano-tomography. 3D structures using cryogenic high-angle annular dark field scanning transmission electron microscopy (Cryo-HAADF-STEM), which is a more accurate method for nanoparticle morphology than conventional chemisorption, are correlated with experimental reversible hydrogen adsorption properties. The correlations provide the first direct evidence of very high activity on the nanoparticle surface and the nature of adsorption sites. The results have important implications in general for the use of electron nano-tomography in the design of supported metallic nanoparticles for hydrogen separation membranes.
机译：我们报告了分散在无定形二氧化硅（SiO_2）中的技术上重要的镍（Ni）纳米点（纳米颗粒）的发展对氢分离膜的高温渗透选择性（在烃反应和H_2产生中至关重要）的影响，并提出了三维三维的系统重构使用电子纳米断层扫描技术的纳米点的（3D）结构。使用低温高角度环形暗场扫描透射电子显微镜（Cryo-HAADF-STEM）的3D结构是一种比常规化学吸附更精确的纳米粒子形态方法，与实验可逆的氢吸附特性相关。相关性提供了纳米粒子表面上非常高的活性以及吸附位点性质的第一个直接证据。该结果总体上对于在设计用于氢分离膜的负载金属纳米颗粒的设计中使用电子纳米断层扫描具有重要意义。

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