Degradation of brominated flame retardants and synthesis of advanced functional carbon materials are two important issues in the energy and environment fields, which may be realized simultaneously in a unified process, to successfully “kill two birds with one stone”. Here, hazardous decabromodiphenyl ether (BDE-209) is converted into oxygenic graphyne with a unique structure and high electrochemical performance via its mechanochemical reaction with CaC2. The resulting oxygenic graphyne possesses a unique composition and structure with an alkynyl-linked BDE-209 carbon skeleton, highly ordered multilayered structure and in situ doped oxygenous groups. Furthermore, oxygenic graphyne can serve as a good carbonaceous electrode for supercapacitors owing to its excellent cycling stability, outstanding electrical conductivity and high specific capacitance (257.6 F cm−3). This work realizes efficient degradation of hazardous BDE-209 and green synthesis of functional alkynyl carbon materials, and is an important reference for tackling current problems in energy, environment and materials.
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