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(a) Schematic illustration of the synthesis process of P-NCF. (b,e) SEM and (c,d,f,g) TEM images of (b–d) P-NCF and (e–g) S@P-NCF. The insets in (d,g) are the corresponding SAED images. (h) Annular dark-field STEM image and (i–k) corresponding elemental mappings of S@P-NCF.
