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FESEM images of (a) Ni-MOF particles synthesized by hydrothermal method; (b) PAN nanofibers; (c,d) PAN/Ni-MOF composite nanofibers before extraction in different magnification; (e,f) electrospun PAN/Ni-MOF nanofibers after 160 times extraction in different magnification. Reprinted with permission from Ref. [90]. Copyright (2021) Elsevier.
