Multi−component absorbers can improve microwave absorption performance by incorporating multiple loss mechanisms. However, many multi−component absorbers containing magnetic metal-based nanomaterials are unstable, owing to aggregation and oxidation of metal nanomaterials. In this work, (Fe_0.64Ni_0.36@C/Mo₂C@C)@N−C composites were prepared by mixing nickel molybdate, potassium ferricyanide, and dopamine to form a precursor which was subsequently carbonized. The Fe_0.64Ni_0.36 and Mo₂C nanoparticles in the composites were stabilized by a thin graphitic carbon coating and uniformly dispersed throughout the N-C matrix. This unique structure provided abundant interfaces for microwave absorption, whilst also effectively inhibiting the aggregation and oxidation of the metal-containing phases. One of the prepared composites, (Fe_0.64Ni_0.36@C/Mo₂C@C)@N−C−3, possessed excellent microwave absorption properties, evidenced by a wide effective absorption bandwidth (EAB) of 5.7 GHz (11.9−17.6 GHz) at 2.0 mm thickness, and the minimum reflection loss value (RL_min) of −37.5 dB at 11.92 GHz and 2.5 mm thickness (at a filling amount of 16.7%).

多组分吸收器可以通过结合多种损耗机制来提高微波吸收性能。然而，由于金属纳米材料的聚集和氧化，许多含有磁性金属基纳米材料的多组分吸收剂不稳定。在这项工作中，(Fe _0.64 Ni _0.36 @C/Mo ₂ C@C)@NC 复合材料通过混合钼酸镍、铁氰化钾和多巴胺形成前体，随后将其碳化来制备。Fe _0.64 Ni _0.36和 Mo ₂复合材料中的 C 纳米颗粒通过薄石墨碳涂层稳定，并均匀分散在整个 NC 基质中。这种独特的结构为微波吸收提供了丰富的界面，同时也有效地抑制了含金属相的聚集和氧化。其中一种制备的复合材料 (Fe _0.64 Ni _0.36 @C/Mo ₂ C@C)@N−C−3 具有出色的微波吸收性能，有效吸收带宽 (EAB) 高达 5.7  GHz (11.9−17.6)  GHz) 在 2.0  mm 厚度下，最小反射损耗值 (RL _min ) 在 11.92  GHz 和 2.5  mm 厚度（填充量为 16.7%）下为 −37.5 dB。