title: The three-dimensional morphology of nickel nanodots in amorphous silica and their role in high-temperature permselectivity for hydrogen separation.
abstract: We report the development of technologically important nickel (Ni) nanodots (nanoparticles) dispersed in amorphous silica (SiO2) 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.
authors: The Nanocentre and the Department of Chemistry, The University of York, Heslington, York YO10 5BR, UK. ky512@york.ac.uk
authors: Kenta
authors: K
authors: Yoshida
authors: Yumi H
authors: YH
authors: Ikuhara
authors: Seiji
authors: S
authors: Takahashi
authors: Tsukasa
authors: T
authors: Hirayama
authors: Tomohiro
authors: T
authors: Saito
authors: Shogo
authors: S
authors: Sueda
authors: Nobuo
authors: N
authors: Tanaka
authors: Pratibha L
authors: PL
authors: Gai