▎ 摘　　要

Lightweight graphene-based aerogels have received considerable attention in the field of microwave absorption. Nevertheless, the controlled synthesis of reduced graphene oxide (rGO) aerogels with tailored pore structures for high-performance microwave absorption is a significant challenge. Herein, pore structure manipulation of reduced graphene oxide aerogels has been realized through a freeze-thaw assembly strategy, which involves chemical prereduction, freeze-thaw, further reduction and freeze-dry processes. By adjusting the prereduction time, the ultralight (5.83 mg/cm3) and highly porous (94.9%) rGO-60 aerogel develops a uniform cellular structure that maximizes multiple reflections and scattering of electromagnetic waves among microcellular free spaces. This achieves a minimal reflection loss of -61.63 dB with an effective absorption bandwidth of 7.8 GHz for an ultralow filling ratio (0.74 wt%). The radar cross-sectional (RCS) simulation further confirms that the rGO60 aerogel can attenuate more electromagnetic energy. Meanwhile, the excellent thermal insulating and antifrosting properties suggest promising applications in cold and humid environments. This work shows that pore structure engineering is a promising strategy for producing lightweight and multifunctional graphene aerogel-based microwave absorbers for complex environmental applications.