Bimetallic Hybridization Induced Multi‐polarization Loss in Multiphase Solid Solution for Electromagnetic Wave Absorption ^†

Comprehensive Summary Aiming at the polarization loss bottleneck in electromagnetic wave (EMW) absorbing materials, we propose a new bimetallic hybrid strategy towards multiphase solid solutions to increase multiple polarization losses. Assisted by polydopamine (PDA) as crystalline phase inducer, Mo/W substances were anchored in situ on carbon networks. As a result, a carbon‐supported MoC 1– x /WC/W 2 C/WC 1– x heterostructure was formed. This process leads to Mo migration and W occupying vacancies, resulting in vacancy/substitution defects. Simultaneously, Li + is inserted into the solid solution to form an interstitial structure. Due to the synergistic effect of multiple polarization losses, the Mo2W‐900 solid solution achieved excellent EMW absorption performance. The minimum reflection loss (RL min ) at a thickness of 2.5 mm is –65.92 dB, and it has a maximum effective absorption bandwidth (EAB max ) of 6.16 GHz at only 2.1 mm. This paper establishes a new type of multi‐loss polarization model for solid‐solution absorbers, providing important theoretical guidance for the design of the next generation of hybrid absorbers.