Activation effect of porous structure on fluorination of graphene based materials with large specific surface area at mild condition

Fluorinated 2D porous graphene-based materials, FPGMs, were synthesized by using porous activated graphene material as raw material. The fluorination of PGM was activated through the introduction of meso- and micropores which generated a large number of vacancy, edges and defects. The fluorinated sample FPGM-10 with a F/C ratio of 0.67 was obtained at room temperature. Meanwhile, the temperate fluorination conditions guaranteed the porous structure from destruction, which endowed the FPGMs with large specific surface area and well-defined micro- and mesopores, among which FPGM-10 exhibited a BET SSA value of around 1100 m2/g. It was found the bare C atoms near the CF bonds with unpaired electron showed high reactivity with F2 resulting in the clustering of fluorine atoms at the edges, thus highly fluorinated edge region was formed. The thermogravimetric analysis, electrochemical measurement and computer simulation results simultaneously confirmed this structural characteristic ensured FPGMs with high chemical and thermal stability.

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