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a 4um 00nm 250nm Fig.2. SEM images of (a) yeast template, (b) NiO microspheres before calcination, (c) and (d) NiO hollow microspheres after calcination, (e) NiO particles prepared without yeast template and (f) NiO/C hollow microspheres. Calcination at 600C 2um 2um d (200) (111) (220) (311) 2um 20 30 40 60 70 80 Fig.7. SEM images of the NiO products calcined at (a) 300, (b) 450, and (c) 600 C and (d) XRD patterms of the NiO products gained at different temperature. 2h calcification 2 2um 2um 2um Fig.8. SEM images of the products from an ageing time of (a) 6, (b) 12, and (c) 24 h.

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