Fig. 2.

Preparation and characterization of the SA Ni/Y₂O₃ nanosheets. a Schematic of the preparation process for Y₂O₃ nanosheets decorated with single Ni atoms (SA Ni/Y₂O₃). b XRD pattern, c N₂ adsorption–desorption isotherm, d SEM image, e TEM image, f HRTEM image, g STEM image, and EDS mapping images of Ni, Y, and O of the SA Ni/Y₂O₃ nanosheets. The inset in f is the corresponding electron diffraction pattern. The scale bars in d, e, f, and g are 1000, 200, 2, and 20 nm, respectively