Fig. 1: Characterizations of Ru/MgO(111), Ru/MgO(110) and Ru/MgO(100).
From: Dispersed surface Ru ensembles on MgO(111) for catalytic ammonia decomposition
a XRD patterns of MgO(111) samples prepared in different solvents. Note: MgO(111)-PS and MgO(111)-NPS are assembled in ethanol and n-hexane as the polar solvent (PS) and non-polar solvent (NPS), respectively; b illustration of XRD patterns from ideally aligned MgO(111) nanosheets perpendicular and parallel to the diffraction vector s; c XRD patterns of 3.1 wt.% Ru supported on MgO with different predominant exposed facets; d HAADF-STEM images of 3.1 wt.% Ru/MgO(111), the scale bar in yellow is 2 nm; e HAADF-STEM images with observed single Ru atoms in the form of single Ru atoms, 2×Ru atoms, 3×Ru atoms and other close-by surface Ru atoms; the scale bar in yellow is 0.5 nm; Exp: experimental image, Sim: image simulation (see SI); f Ru 3p XPS profiles of samples, the scale bar in yellow is 2 Å; g Fourier transform of k3-weighted Ru K-edge of EXAFS spectra of the Ru/MgO(111). The Ru metal foil is also included here for reference; The insert figure is simulated model of Ru coordinating with 3-oxygen atoms (trigonal site) on (111) oxygen terminated surface.
