Structure and electronic properties of Cu nanoclusters supported on Mo2C(001) and MoC(001) surfaces

摘要

The atomic structure and electronic properties of Cu-n nanoclusters (n = 4, 6, 7, and 10) supported on cubic nonpolar delta-MoC(001) and orthorhombic C-or Mo-terminated polar beta-Mo2C(001) surfaces have been investigated by means of periodic density functional theory based calculations. The electronic properties have been analyzed by means of the density of states, Bader charges, and electron localization function plots. The Cu nanoparticles supported on beta-Mo2C(001), either Moor C-terminated, tend to present a two-dimensional structure whereas a three-dimensional geometry is preferred when supported on delta-MoC(001), indicating that the Mo: C ratio and the surface polarity play a key role determining the structure of supported clusters. Nevertheless, calculations also reveal important differences between the C-and Mo-terminated beta-Mo2C(001) supports to the point that supported Cu particles exhibit different charge states, which opens a way to control the reactivity of these potential catalysts. (C) 2015 AIP Publishing LLC.