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. 2020 Aug 6;11:3908. doi: 10.1038/s41467-020-17738-9

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Fig. 1 — a Pd₁@HEFO, showing the possible high dispersion of a small portion of Pd single atoms on the surface of HEFO support and incorporation of a large portion of Pd single atoms into HEFO sublattice after calcination at 900 °C. b Pd@CeO₂, showing the aggregation of Pd clusters predominantly located on the surface of CeO₂.