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Iron distribution inside Fe/N/CF fiber. (A) STEM image of a section of Fe/N/CF fiber showing no iron particle agglomeration. (B) Mapping of Fe element distribution on the Fe/N/CF section shows iron intensity is proportional to the fiber thickness of catalyst, suggesting that Fe is uniformly and possibly atomically dispersed inside the fiber. (C) A representative EDX spectrum of the Fe/N/CF. The Fe signal could be detected ubiquitously on the fibrous catalyst.
