fig6

Figure 6. (A) Synthesis of C₂N via wet-chemistry process^[54]; (B) Charge and discharge curves of C₂N-450 at various C-rates (1C = 372 mA·g^-1)^[54]; (C) Rate capability test for PCN-350 in SIB (1C = 300 mA·g^-1)^[55]; (D) Cycling stability of the PCN-350 anode (at 600 mA·g^-1)^[55]; (E) Synthesis of C₂N from HAT-CN; (F) Rate performance at different current densities from 0.1 to 1.6 A·g^-1[56]. Reproduced from: (A and B) Xu et al. (2017), Wiley^[54]; (C and D) Yan et al. (2022), American Chemical Society^[55]; (E and F) Xia et al. (2022), ScienceDirect^[56]. PCN: Polymeric carbon nitride; SIB: sodium-ion battery; HAT-CN: hexaazatriphenylene-hexacarbonitrile.