As　a　novel　type　of　carbon　materials,　graphynes　possesses　the　merits　of　high　carrier　mobility　and　large　surface　areas,　etc.　However,　to　date,　the　main　research　of　graphynes　is　focused　on　theoretical　calculation　whereas　few　strategies　have　been　reported　for　the　fabrication　of　graphynes.　In　this　work,　a　facile　method　named　ultrasound-promoted　synthesis　was　developed　to　fabricate　γ-graphyne　using　PhBr6　and　CaC2　as　the　raw　materials.　The　reaction　system　in　argon　atmosphere　ultrasonically　vibrated　for　24　h　in　the　ultrasonic　bath　at　a　power　of　180　W　and　frequency　of　53　kHz.　The　structure,　morphology,　and　component　of　the　obtained　samples　were　detected　by　X-ray　diffraction,　Raman　spectroscopy,　X-ray　photoelectron　spectroscopy,　FT-IR　spectra,　scanning　electron　microscopy,　transmission　electron　microscopy,　and　the　selected　area　electron　diffraction.　The　electrochemical　and　photoelectrochemical　measurements　indicate　that　γ-graphyne　can　be　used　as　superior　electrode　mateirals　in　supercapacitor　and　photoelectrochemical　catalysis.　From　the　results　of　galvanostatic　charge/discharge　measurements,　the　γ-graphyne　supercapacitor　delivers　a　maximum　specific　capacitance　of　81　F/g　at　0.2　A/g　and　a　capacitance　retention　rate　of　87.5%　after　5000　cycles　at　3　A/g.　Moreover,　UV-vis　light　photoelectrochemical　response　and　high　carrier　density　are　observed　for　γ-graphyne.　It　is　also　demonstrated　that　the　charge-transfer　resistance　is　low　by　Tafel　slopes　and　Nyquist　plots.　This　work　puts　forward　a　new　and　facile　strategy　for　the　fabrication　of　γ-graphyne　and　explores　its　application　in　the　field　of　solar　energy　conversion　and　storage.　©　2019　Elsevier　B.V.