Fig. 7

AFM analysis using non-contact mode over (a) Untreated Al spiral, (b) Activated Al spiral, and (c) Spiral-structured Ni/CeO2 catalyst (sample of 120 mg), including the corresponding digital photos.

AFM analysis using non-contact mode over (a) Untreated Al spiral, (b) Activated Al spiral, and (c) Spiral-structured Ni/CeO2 catalyst (sample of 120 mg), including the corresponding digital photos.