Fig. 1
From: Quasi Pd1Ni single-atom surface alloy catalyst enables hydrogenation of nitriles to secondary amines
Synthesis and morphologies of xPd-Ni/SiO2 bimetallic catalysts. a Schematic illustration of synthesis of xPd-Ni/SiO2 bimetallic catalysts using selective Pd ALD. b Pd loadings in the xPd-Ni/SiO2 and xPd/SiO2 samples determined by ICP-AES. c STEM image of 20Pd-Ni/SiO2 and the corresponding EDS elemental mapping signals: Ni Kα (d), Pd Lα (e) and the constructed Ni + Pd (f). Scale bar in c 20 nm. g A representative HAADF-STEM image of 5Pd-Ni/SiO2. Isolated Pd single atoms on partially-oxidized Ni NPs were highlighted by brown arrows. Scale bar: 2 nm. h Intensity profile along the line X–Y in g highlighting the presence of Pd single atoms. i A representative HAADF-STEM image of 20Pd-Ni/SiO2. Scale bar: 2 nm. The red circles in i highlight contrast of the inner core and outer shell of the NPs. j A STEM image of 20Pd-Ni/SiO2. k EDS line profile analysis across the NP in j
