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Fig. 2. (a) SEM and (b) ADF STEM images of NiCo2O4 nanoneedles. (c) EELS elemental distribution maps obtained with the Co L2,3-edge (red), Ni L2,3-edge (blue), O K-edge (green) and their color composite in NiCo2O4 nanoneedles from the red squared area in (b).