Eggshell membrane-derived Co-Co_xS_y-Ni/N, S-codoped carbon composites (EM-Co-Co_xS_y-Ni/N, S-C) were synthesized by calcinating Co²⁺-Ni²⁺-2-methylimidazole /eggshell membrane precursor in N₂ atmosphere. The dual atom (nitrogen (N) and sulfide (S)) doping for C was realized easily by using eggshell membrane as the joint source of carbon, N and S. The EM-Co-Co_xS_y-Ni/N, S-C composites showed remarkable electromagnetic wave absorption (EMWA) performance. The minimum reflection loss (RL_min) reached -48.5 dB (10.1 GHz, 3.5 mm) and the effective absorption bandwidth (EAB) achieved 7.4 GHz (10.3-17.7 GHz, 3 mm). By adjusting the concentration of 2-methylimidazole, impressive RL_min (-41.5 dB, 13.9 GHz) and EAB (6.5 GHz, 11.5-18 GHz) could be achieved at a thinner match thickness of 2.5 mm. Eggshell membrane exhibits considerable potentials in designing heteroatom doped carbon based EMW absorbents with high-performance and low cost.

通过煅烧Co ²⁺ -Ni ²⁺ -2-合成蛋壳膜衍生的Co-Co _x S _y -Ni/N、S-共掺杂碳复合材料（EM-Co-Co _x S _y -Ni/N, SC）N ₂气氛中的甲基咪唑/蛋壳膜前体。通过使用蛋壳膜作为碳、氮和硫的联合源，很容易实现 C 的双原子（氮 (N) 和硫化物 (S)）掺杂。 EM-Co-Co _x S _y -Ni/N, SC复合材料表现出显着的电磁波吸收（EMWA）性能。最小反射损耗（RL _min) 达到 -48.5 dB (10.1 GHz, 3.5 mm)，有效吸收带宽 (EAB) 达到 7.4 GHz (10.3-17.7 GHz, 3 mm)。通过调整 2-甲基咪唑的浓度，可以在 2.5 毫米的更薄匹配厚度下实现令人印象深刻的 RL _min（-41.5 dB，13.9 GHz）和 EAB（6.5 GHz，11.5-18 GHz）。蛋壳膜在设计高性能、低成本的杂原子掺杂碳基 EMW 吸收剂方面具有巨大的潜力。