Polymeric nitrogen (polynitrogen) is attractive candidate for high-energy-density materials due to the significant energy stored in nitrogen-nitrogen bonds. We firstly reported two two-dimensional layered polynitrogen structures (Amm2-${\mathrm{CN}}_6$ and Amm2-${\mathrm{CN}}_{10}$) using the ${\mathrm{C}}_2{\mathrm{N}}_8$ cage as the building blocks. The layered structures of Amm2-${\mathrm{CN}}_6$ exhibits the tunable size capabilities, as its monolayer can be exfoliated and restacked under ambient conditions. Besides, substituting carbon atoms with boron to introduce holes in Amm2-${\mathrm{CN}}_6$ transforms the material from a semiconductor into a superconductor, achieving a ${\mathrm{T}}_c$ of 7.1 K at ambient pressure. In addition, both Amm2-${\mathrm{CN}}_6$ and Amm2-${\mathrm{CN}}_{10}$ exhibit the outstanding energetic and explosive properties, with respective energy densities of 8.1 and 8.9 kJ/g, detonation velocities of 10.4 and 8.8 km/s, and detonation pressures of 60.9 and 44.9 GPa. These findings offer valuable insights for the design of advanced energetic and superconducting polynitrogen compounds.

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• Chemical bonding
• Electronic structure
• First-principles calculations
• Structural properties
• Superconductivity