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a) Co 2p high‐resolution XPS spectra of Co–C/CF. b) Bi 4f, c) C 1s, and d) N 1s high‐resolution XPS spectra of Bi–C/CF. e) Raman spectra of Bi–C/CF and blank carbon fiber. f) Schematic structure of partially graphitized, nitrogen‐doped carbon derived from the Co‐MOF, as well as the synthesis of bismuth and carbon composite by confined replacement reaction.
