Experimental Section Materials Synthesis. The porous tricobalt tetraoxide nanowires were fabricated by the route of the solution phase and precursor. All the reagents used were AR grade and were not purified further. DI water was used throughout the experiment. Firstly, cobalt nitrate hexahydrate (25 mM) and sodium fluoride (25 mM) were dissolved in water (50 mL), and then 25 mL urea aqueous solution (50 mM) was added in the above mixed solution under stirring to obtain pink precursor solution.

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... The as-prepared mixed solution was transferred into a 100 ml Teflon-lined stainless steel autoclave and kept at 150 o C for 2 h after sealed. The light pink flocculent precipitates were collected by centrifugation and dried at 80 o C oven for 12 h after rinsing several times with water. The gray-black final products were produced by heating as-prepared light pink flocculent precipitates in air at 350~550 o C for 2h with a ramping rate of 2 o C/min. Fluoride ion modification. Commercial tricobalt tetraoxide (400 mg) and Electronic Supplementary Material (ESI) for ChemComm. This journal is