Figure 9.

a Schematic presentation of the evolvement process of anisotropic Co₃O₄ porous nanocapsules; b low-magnification SEM image showing that these nanocapsules are monodisperse with a uniform size; c low-magnification TEM image showing the porous shell of anisotropic Co₃O₄ nanocapsules; d high-magnification TEM image exhibiting a single porous Co₃O₄ nanocapsule; e HRTEM image of individual nanocrystals revealing the (111) lattice plane