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(A) Schematic of the formation of Co4N@NC-m and Co4N@NC; (B) XRD patterns of Co4N@NC-m and Co4N@NC; (C) LSV curves in 0.1 M KOH electrolyte for ORR; (D) LSV curves in 0.1 M KOH electrolyte for OER. Reproduced with permission from [100]. Copyright © 2019 Elsevier.
