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(A) Schematic of the formation of the porous Ni3FeN hierarchical microspheres; (B–D) SEM images of the NiFe LDH hierarchical microspheres; (E–G) SEM images of the porous Ni3FeN hierarchical microspheres; (H) LSV curves in 0.1 M KOH electrolyte for ORR; (I) LSV curves in 0.1 M KOH electrolyte for OER. Reproduced with permission from [100]. Copyright © 2017 Elsevier.
