Lightweight MXene@Ag‐Engineered Wood Aerogels for Anisotropic and Tunable Electromagnetic Interference Shielding

In recent years, MXene has attracted significant attention for electromagnetic interference (EMI) shielding due to its unique layered structure and excellent conductivity. However, its mechanical limitations pose challenges for practical implementation. In this study, a lightweight, anisotropic MXene@Ag/wood aerogel composite is fabricated by integrating MXene with silver nanoparticles and loading it onto the cellulose framework of wood aerogels (WAs). The WAs are derived from natural wood through an eco‐friendly delignification process. The composite leverages the 3D porous structure of natural wood and the high conductivity of MXene, while the incorporation of silver nanoparticles further enhances its EMI shielding performance, achieving a shielding effectiveness of up to 71.15 dB. It also exhibits a desirable low density of 0.065 g cm − 3 and high SSE/t value of 4904.75 dB cm 2 g −1 , demonstrating excellent lightweight properties. Its anisotropic structure results in direction‐dependent shielding, which can be adjusted by material orientation, offering flexibility for diverse applications. Moreover, strong triboelectric nanogenerator output highlights its potential in flexible electronics. This composite holds promising applications in high‐frequency circuits, communication systems, and aerospace, reducing EMI interference and enhancing system stability and safety. This study introduces a new strategy for developing lightweight, efficient EMI shielding materials.