Hierarchical Co₂P/CoS₂@C@MoS₂ Composites with Hollow Cavity and Multiple Phases Toward Wideband Electromagnetic Wave Absorption

Abstract

The synergistic effect of hollow cavities and multiple hetero‐interfaces displays huge advantages in achieving lightweight and high‐efficient electromagnetic wave absorption, but still confronts huge challenges. Herein, hierarchical Co 2 P/CoS 2 @C@MoS 2 composites via the self‐sacrificed strategy and a subsequent hydrothermal method have been successfully synthesized. Specifically, ZIF‐67 cores first act as the structural template to form core‐shell ZIF‐67@poly(cyclotriphosphazene‐co‐4,4′‐sulfonyldiphenol) (ZIF‐67@PZS) composites, which are converted into hollow Co 2 P@C shells with micro‐mesoporous characteristics because of the gradient structural stabilities and preferred coordination ability. The deposition of hierarchical MoS 2 results in phase transition (Co 2 P→Co 2 P/CoS 2 ), yielding the formation of hierarchical Co 2 P/CoS 2 @C@MoS 2 composites with hollow cavities and multiple hetero‐interfaces. Benefiting from the cooperative advantages of hollow structure, extra N,P,S‐doped sources, lattice defects/vacancies, diverse incoherent interfaces, and hierarchical configurations, the composites deliver superior electromagnetic wave capability (−56.6 dB) and wideband absorption bandwidth (8.96 GHz) with 20 wt.% filler loading. This study provides a reliable and facile strategy for the precise construction of superior electromagnetic wave absorbents with efficient absorption attenuation.