Green synthesis of oxygenic graphyne with high electrochemical performance from efficient mechanochemical degradation of hazardous decabromodiphenyl ether

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. Hazardous decabromodiphenyl ether is efficiently converted into oxygenic graphyne with unique structure and high electrochemical performance via a green mechanochemical reaction with CaC2.