A General Synthesis Strategy for Hierarchical Porous Metal Oxide Hollow Spheres

Figure 1

SEM photographs of carbon spheres prepared by different concentration of glucose, hydrothermal temperature, and time. (a) 0.5 mol/L, 220°C, 12 h; (b) 0.5 mol/L, 200°C, 12 h; (c) 0.5 mol/L, 180°C, 12 h; (d) 0.5 mol/L, 220°C, 10 h; (e) 0.5 mol/L, 220°C, 8 h; (f) 0.75 mol/L, 220°C, 12 h.

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