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CoCl2•6H2O (0.7138 g, 3 mmol) was dissolved in EG (24 mL) to form a transparent solution, and then sodium acetate (CH3COONa, NaAc) (2.16 g) and polyethylene glycol 200 (PEG200) (0.6 g) were added into the above solution. The mixed solution was stirred and gradually became transparent, and then sealed in a Teflon-lined stainless-steel autoclave (30 mL capacity). The autoclave was heated to and maintained at 180 ¡ãC for 12 h, and allowed to cool to room temperature. The peach products were collected and rinsed more than five times by ethanol, and dried at 60 ¡ãC for 5 h, which was the intermediate complex of Co3O4 hollow microspheres. After the peach product was annealed at 500 ¡ãC for 20 min, Co3O4 hollow microspheres were obtained.
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