The
design of high-performance electromagnetic wave (EMW) absorbers
utilizing metal–organic framework (MOF) derivatives has garnered
significant attention. However, enabling it to implement dual-band
EMW absorption (EMWA) with a sole material remains a substantial challenge.
Herein, we devise a strategy involving bimetallic Zn/Co-MOF precursors
and realize the modulation of their micro–nanostructure via
altering the molar ratio of Zn/Co. ZnO/Co@porous carbon (PC) composites
are successfully fabricated via pyrolysis with advanced dual-band
EMWA properties, attributed to the synergistic effect of the multiphase
heterogeneous structure, impedance matching, and multiple magnetic
dielectric loss mechanisms. Zn0.1Co0.9-BTC-derived
ZnO/Co@PC composites exhibit good performance with the minimum reflection
loss/the maximum effective absorption bandwidth values of −69.3
dB/6.3 and −48.8 dB/7.2 GHz, in the range of 2–18 and
26.5–40 GHz with minimum thicknesses. The superior dual-band
attenuation properties of the as-prepared material have been verified
by radar cross-section simulation. This research paves the way for
novel guidance for utilizing MOF derivatives as potential candidates
for dual-band compatible EWMA and offers profound insight into the
underlying mechanism of microwave absorption with dual bands.