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. 2017 Aug 23;3(8):e1700732. doi: 10.1126/sciadv.1700732

Fig. 2. Formation process and mechanism of the KCoFe-1 NAFSs.

Fig. 2

(A) FESEM images of the samples obtained at 5 s and 2, 6, 9, 18, and 36 hours of the reaction process, showing the morphological change from NCs to NAFSs. (B) Schematic illustration of the formation mechanism of a NAFS, in which four stages were involved: I, site-selected deposition; II, the formation of the new KCoFe-1 phase; III, epitaxial growth of the NCBs; IV, core@satellite superstructure transform to NAFS. (C) Mechanism of the hydroxyl-potassium ion insertion triggered PCET. (D) Ordered arrangement of NCBs on three orthogonal edges of the core@satellite superstructure in (B) (marked by black dashed lines). (E) Two types of outcome from the OA of adjacent NCBs: type I, neck attaching; type II, total integration.