Figure 4

TEM images of(a, b) NiCo2O4 NCAs taken at low- and high-magnifications; (c) NiCo2O4@NiCo2O4 core/shell nanocactus; (d, e) HRTEM image and SAED pattern of the shell in (c); (f) EDS of the shell in (c).

TEM images of(a, b) NiCo2O4 NCAs taken at low- and high-magnifications; (c) NiCo2O4@NiCo2O4 core/shell nanocactus; (d, e) HRTEM image and SAED pattern of the shell in (c); (f) EDS of the shell in (c).