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(A) Schematic of the synthesis route of Co4N@NC PNCs. (B) Schematic diagram of the formation of porous CoxNiyN composites. (C) Schematic illustration of the synthesis process of mesoporous Co3N@amorphours N-doped carbon NCs. Reproduced with permission from [54,55,56]. Copyright © 2018 and 2019 American Chemical Society. Copyright © 2019 Tsinghua University Press.
