WC-incorporated carbon hollow-hetero sphere derived from WO4-node hybrid crystalline framework for efficient electromagnetic wave absorption

Constructing hetero -interfaces in dielectric type electromagnetic wave absorbing materials (EWAMs) is of great significance, yet remains a formidable challenge. Herein, a WC-incorporated carbon hollow-hetero sphere was constructed from 3d/5d-bimetallic ZnW hybrid zeolitic imidazolate framework (ZnW-HZIF) through chemical etching and calcination. The RLmin reaches -63.72 dB at a thickness of 2.4 mm under a filler loading of 15 wt%, providing a wide effective absorption bandwidth of 10.4 GHz that covers the entire X-band at a thickness of 3.5 mm. The designed hollow structure and tunable WC/NC heterogeneous interfaces effectively enhance the dipolar/interfacial polarization while also facilitating the impedance matching. This research reveals a rational structural design strategy and practical technical methods for fabricating high-performance hollow and heterostructured non-magnetic carbon-based electromagnetic wave absorbing materials.