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(a) SEM image of Co3O4 nanoflowers. (b) TEM image of Co3O4 nanoflowers. Reproduced from Ref. [44] with permission from Elsevier, Copyright 2020. (c) Schematic crystal structures of PrBaCo2O5.75 (left) and PrBaCo2O5.5.(right) Color codes: Pr=orange, Ba=green, Co=blue, O=red. Reproduced from Ref. [26] with permission from The Royal Society of Chemistry, Copyright 2019.
