Self-Assembly of 3D Fennel-Like Co₃O₄ with Thirty-Six Surfaces for High Performance Supercapacitor

Figure 4

(a) and (b) are the SEM images of 3D fennel-like Co₃O₄ particles (prepared for 12 h at 120°C); (c) and (d) are the hexagonal Co₃O₄ particles (prepared for 5 h at 120°C).

(a)

(b)

(c)

(d)