Fig. 2.
a, b SEM and c, d TEM images of MnO/CoMn2O4 ⊂ GN. e High-magnification TEM image of MnO/CoMn2O4 ⊂ GN. f The corresponding elemental mapping images of the MnO/CoMn2O4 ⊂ GN for Co, Mn, O, and C
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