Wood-derived porous carbon foams filled with Ti3C2TxMXene/CoFe-MOF for electromagnetic shielding with flame retardant, heat insulation and excellent cycle stability

In solving the problem of electromagnetic pollution, microwave absorbing materials with excellent electromagnetic wave attenuation have been widely concerned. In this study, using renewable wood-derived porous carbon (WPC) skeleton as template and highly ordered cellular cells inside WPC as microreactors, ultra-light, flame retardant, heat insulating and good cycle stability CoFe-MOF@Ti3C2Tx MXene@Sodium alginate@WPC (MMSW) composites were prepared. When the thickness is 1.5 mm, the microwave absorption value of MMSW900 reaches −57 dB and the EAB value arrives 5.8 GHz. By varying the thickness of the MMSW900 within 1.5–6.0 mm, the peak value of RL can exceed −20 dB in the range of 6–18 GHz. At the same time, the MMSW900 shows excellent Joule thermal performance and still exhibits high electrothermal conversion efficiency after continuous voltage application. MMSW900 remains unchanged form after 90 s heating on the alcohol lamp, indicating that it has excellent flame retardant performance. This multifunctional ultra-light wave absorbing material with flame retardant, heat insulation and good cycle stability offered great application potential in high-end electromagnetic interference shielding fields such as aerospace and defense industry.