Fig. 2

The SEM micrographs of (a) NiCo(O).1mL, (b, c) Magnified micrographs of NiCo(O).1mL, (d) NiCo(O).2mL, (e, f) Magnified micrographs of NiCo(O).2mL, (g) NiCo(O).5mL, (h, i) Magnified micrographs of NiCo(O).5mL, (j) NiCo(O).10mL and (k, l) Magnified micrographs of NiCo(O).10mL.