Figure 4

TEM images of (a) ZnO@C and (b) TiO2@C NPs. The insets are the corresponding EDS-line scan patterns; and (c) the carbon shell after the removal of ZnO core.

TEM images of (a) ZnO@C and (b) TiO2@C NPs. The insets are the corresponding EDS-line scan patterns; and (c) the carbon shell after the removal of ZnO core.