Synthesis of hydrogen-substituted graphyne film via dehalogenative homocoupling reaction

Graphynes (GYs) are a new type of carbon-rich materials, which consist of sp and sp2 hybrid carbon atoms. The extended existence of sp and sp2-hybridized carbon atoms endow GYs with high π-conjunction, tunable electronic properties, two-dimensional plane framework, and uniformly distributed pores. GYs have drawn particular attention, due to the special structures and chemical/physical properties. As a member of the GYs family, graphyne (GY) and its analogues possess both great stability and high carrier mobility. However, the development of GY is very slow due to the limitation of synthesis methods. This work provides a novel strategy for the synthesis of hydrogen substituted graphyne (HsGY), in which the alkyne bond is formed directly by dehalogenation coupling reaction of C (sp3)-Br3 functional group. The electrocatalytic properties of the sample are determined using a three-electrode cell. [Display omitted] •Hydrogen substituted graphyne (HsGY) was synthesized through dehalogenative homocoupling reaction in the solution.•The HsGY film was characterized by SEM, EDS, Raman, FT-IR, and XPS.•This work provides a new potential solution method for the preparation of GYs.