Fig. 4. SEM images of all four catalysts with two different resolutions. The four images on the top show zoomed out images of catalysts presumed to be (a) Co3O4, (c) Co1.5Al1.5O4, (e) Co2.5Ga0.5O4 and (g) Co1.5Ga1.5O4. The images at the bottom show zoomed in images of the same catalysts thought to be (b) Co3O4, (d) Co1.5Al1.5O4, (f) Co2.5Ga0.5O4 and (h) Co1.5Ga1.5O4.
