Figure 3

SEM and TEM images of (A,B) Ni-precursor@CNT, (C,D) Co-precursor@CNT, (E,F) NiCo-precursor@CNT and (G,H) ZnCo-precursor@CNT.

SEM and TEM images of (A,B) Ni-precursor@CNT, (C,D) Co-precursor@CNT, (E,F) NiCo-precursor@CNT and (G,H) ZnCo-precursor@CNT.