高性能电磁吸收与隔热用界面工程化Mo2C MXenesOA

The escalating issue of electromagnetic(EM)pollution necessitates the development of multifunctional materials integrating efficient absorption with thermal management.Herein,we report a dual-functional design based on interface-engineered Mo2C MXenes.Through a molten-salt etching strategy,metal ions(Cu/Fe)were in situ doped into Mo2C,constructing heterostructures that significantly enhance interfacial polarization and defect-induced dipole relaxation.The optimized Mo2C/Fe composite demonstrates exceptional EM absorption performance,achieving the reflection loss of-41.8 dB at 2.0 mm with a broad bandwidth of 5.12 GHz.This enhancement is attributed to the synergistic effect of optimized impedance matching and multi-scale polarization loss mechanisms.Furthermore,the derived Mo2C/Fe aerogel exhibits ultralow density(0.0235 g cm-3)and outstanding thermal insulation(ΔT<20 ℃ at 80 ℃),exhibiting superior corrosion resistance in neutral environments.This work develops a viable design strategy for advanced MXene-based composites,demonstrating their dual functionality in efficient EM absorption and effective thermal insulation.