The discovery of graphene has opened a new research space into 2D carbon materials and has gained tremendous scientific attention about their fundamental properties and potential applications. [1-6] Up to now, numerous 2D carbon allotropes have been proposed and investigated, for instance, pentaheptites R 57-1 and R 57-2 , [7,8] Haeckelite sheets H 567 and O 567 , [8] octite SC, [9] SW-graphene, [10,11] Ψ-graphene, [12,13] T-graphene, [14] POgraphene, [15,16] HOP-graphene, [17] and pha-graphene. [18] These unique 2D carbon allotropes provide rich material platforms for designing and fabricating optoelectronic devices and realizing novel topological phenomena. [10,11,18] Among 2D carbon systems, the graphynes containing both sp and sp 2 hybridized carbon atoms form one of the biggest branches of graphene allotropes. [19] Early in 1987, this low-energy layered phase of carbon was predicted to be of hightemperature kinetic stability by Baughman. [20] The successful synthesis of γ-graphdiyne, β-graphdiyne, carbon ene-yne, and their derivants in experiments further inspired interest in such sp-sp 2 hybridized 2D carbon materials. [21-25] Due to the presence of acetylenic bonds associated with sp states, graphyne possesses exceptional flexibility in the geometric structure and thus exhibits many diverse allotropes, for instance, α-graphyne, β-graphyne, γ-graphyne, R-graphyne, and 6,6,12graphyne. [26-28] In addition to the various structures, fascinating physical and chemical properties have also been predicted for the graphyne family. Because of the Kekule-distortion effect, γ-graphyne and graphdiyne are semiconductors with a moderate bandgap and excellent carrier mobility. [27,29] Benefiting from the insertion of acetylenic linkages, the thermal conductance of graphyne is fundamentally lower than that of graphene, and thus leads to its preeminent thermoelectric conversion efficiency. [30-32] Due to the intrinsic hollow structures, graphyne can adsorb ions effectively or filter molecular selectively, making it a promising candidate material for electrodes or molecular sieves. [33,34] More interestingly, Dirac-cone-characterized electronic band structures are revealed not only in hexagonal graphyne (α-graphyne, [27] Pal-graphyne, [35] δ-graphyne, [36] and circumcoro-graphyne [37]), but also in orthorhombic crystal structures (β-graphyne, [27] 6,6,12-graphyne, [19] S-graphynes, [38] cp-graphyne, [39] 14,14,14-graphyne, [40] and 14,14,18-graphyne [40]).