Xiaoming Sun and Guoxin Zhang
Beijing University of Chemical Technology, China
Posters & Accepted Abstracts: J Material Sci Eng
Sustainable developments of human society rely on the efficient utilization of clean energy, which are now urging effective, low-cost key materials to build up new technologies. Among those promising candidates, carbon materials have been long tested to be effective in widely spread fields. However, their synthesis are currently going through a few drawbacks; for instance, the defunctionalization and carbonizations of carbon raw materials often require high-temperature pyrolysis which emits large amount of gases. And, in most cases, those gaseous byproducts are hazardous. We proposed a facile route to synthesize carbon materials under mild conditions (such as room temperature) via. the defunctionalization of halogenated polymers (such as PVDF, PVDC, and PVC) by strong alkaline (such as KOH). XPS characterization revealed over 75.0 at% carbon presenting in resulted carbon. Meanwhile, synthetic routes to heteroatom doped carbon were also established via. the strategy of polymer dehalogenation. No gaseous byproducts were formed, instead, non-hazardous, easy-to-handle alkali metal-halogen salts were obtained. The underneath mechanism was investigated. Halogen functionalities are easy to leave upon mild activation, as written in text books. The dehalogenated carbon sites are highly reactive that could rapidly couple any adjacent atoms, if carbon, forming C-C, if heteroatom, forming C-X (X represents N, S, P, B and so forth). The strategy of dehalogenation can be also extended to ├ó┬?┬?2D├ó┬?┬Ł halogenated polymer: graphite fluoride (GF). GF could be also defunctionalized at room temperature using strong alkaline and in situ functionalized with O, if applying KOH, or N, if applying NaNH2, leading the formation of water soluble O- or N-doped graphene, respectively. Above mentioned routes to carbon materials, especially, water soluble graphene are benign, environment-friendly, and easy-to-operate, which hold great potentials for practical applications.