Enhanced Photoreduction Activity of Carbon Dioxide over Co₃O₄/CeO₂ Catalysts under Visible Light Irradiation

Figure 7

SEM images of Co₃O₄/CeO₂ photocatalysts with 5.0 wt.% Co₃O₄ calcined at 300°C (a and e), 400°C (b and f), 500°C (c and g), 600°C (d and h), and CeO₂ (i and j).

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

(i)

(j)