Abstract: The regulation of the interfacial electric field plays a pivotal role in magnifying the electromagnetic energy attenuation capability during the design and synthesis of efficient and tunable absorbers for electromagnetic waves (EMW). Herein, a rational and universally applicable two-step hydrothermal method strategy was proposed to effectively control the electronic structure of Mott-Schottky EMW absorbing materials derived from Co-MOF. The as-synthesized Co₃S₄@MoS₂/NC ensures efficient electron transfer, while the change redistribution leads to the emergence of additional electric dipoles under an external EMM field. In addition, the hierarchical Co₃S₄@MoS₂/NC nano-architecture with a hierarchical arrangement in 2D and 3D offers more polarization sites, thereby extending the path for EMW transmission through multiple reflections and scattering. The potential to enhance the EMW absorption performance of Co₃S₄@MoS₂/NC lies in its unique microstructure and substantial surface area, which optimize impedance matching properties through a synergistic effect of dipole and interfacial polarization induced by Mott-Schottky heterointerfaces. As anticipated, the Co₃S₄@MoS₂/NC exhibits a maximum EMW absorption capacity with an RL_min value of -41.97 dB and a broad EAB of 4.24 GHz at a thickness of 2.0 mm. This study provides insights for designing highly efficient Mott-Schottky EMW absorbing materials at the molecular level rationally.

Key words: Electromagnetic wave absorption, Mott-Schottky heterostructures, Multiple loss, Hierarchical structures