Derivatized multi-void composite microplates (CoN_XC) were successfully fabricated for high-efficient electromagnetic wave absorption (EMA) using a two-step pyrolysis process assisted by molten dual-salt-mediated template. Structural analysis indicated that cobalt single atoms coexisted stably with Co nanoparticles in the derived carbon matrix, exhibiting the coupling of Co/graphite heterointerface. Various bonding configurations of Co/N atoms could be modulated by N-doping, in which the percentage of Co-N_X single-atom coordination ranged from 18.58 % to 37.62 %, including CoN₂, CoN₃ and CoN₄ configurations. Theoretical calculations demonstrated that the Co/graphite heterointerface and the Co single-atom configurations could significantly change the charge status and distribution, and synergistically promote dielectric polarization relaxation and electrons transport, which was in favor of strengthening the dielectric loss capacity. Benefiting from these, CoN_XC remained high EMA performance even with filler loading of 10 wt%. In this regard, CoN₂₀C exhibited strong RL peaks in multiple bands involving C-, X- and Ku-band, and its RL_min value reached −63.4 dB at 8.3 GHz, which were superior to most reported derivatized carbon-based composites. This work not only elucidates the synergistic mechanism of EMA by metal single-atom coordination and heterointerface, but also provides a new strategy for developing advanced carbon-based absorbers.

使用熔融双盐介导模板辅助的两步热解过程成功地制造了衍生的多空隙复合微孔板 (CoN _X C)，用于高效电磁波吸收 (EMA)。结构分析表明，钴单原子与衍生碳基体中的钴纳米粒子稳定共存，表现出钴/石墨异质界面的耦合。N掺杂可以调节Co/N原子的多种键合构型，其中Co-N _X单原子配位的百分比范围为18.58%~37.62%，包括CoN ₂、CoN ₃和CoN ₄配置。理论计算表明，Co/石墨异质界面和Co单原子构型可以显着改变电荷状态和分布，协同促进介电极化弛豫和电子传输，有利于增强介电损耗容量。受益于这些，即使填料含量为 10 wt% ，CoN _{X C 仍保持较高的 EMA 性能。}在这方面，CoN ₂₀ C在涉及C-、X-和Ku-波段的多个波段中表现出强烈的RL峰，其RL _min值在 8.3 GHz 时达到 -63.4 dB，优于大多数报道的衍生化碳基复合材料。该工作不仅阐明了EMA通过金属单原子配位和异质界面的协同作用机制，而且为开发先进的碳基吸收剂提供了新的策略。