Ultralow-loading CoNi-MOF enables ultralight graphene aerogels with superior electromagnetic wave absorption

Electromagnetic wave (EMW) absorption materials play a crucial role in mitigating electromagnetic pollution and advancing stealth technology. In this study, we construct ultralight CoNi-MOF@graphene heterostructure aerogel by integrating a trace amount of 1D rod-like CoNi-MOF with graphene. This ultralow doping strategy (4.5 wt%) integrates the anisotropic characteristics of 1D CoNi-MOF nanorods, the hierarchical porous structure derived from graphene, and the presence of heterogeneous interfaces, thereby enabling both impedance matching and multi-scale EMW attenuation. As a result, the CoNi-MOF@graphene aerogel demonstrates outstanding EMW absorption performance, achieving a minimum reflection loss of −42.62 dB and a broad effective absorption bandwidth of 4.20 GHz at a thickness of just 1.5 mm. This study offers valuable insights into the design of high-performance microwave absorbers and facilitates the development of novel functional materials.