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ABF-STEM (left side) and HAADF-STEM (right side) images of the Pdi materials after three cycles of hydrogen adsorption/desorption: (a) well-dispersed Pd nanoparticles with sizes between 6 and 10 nm; (b,c) Pd nanoparticles of 1–2 nm; (d) clusters of Pd atoms and HAADF-STEM images; and – Pd single atoms. For a better visualization, white circles were used. For the Al2O3 lattice fringes, see ref (30).
