3D porous magnetic MXene-based foam: A multifunctional electromagnetic material for electromagnetic wave absorption, wireless communication and energy storage

The foam achieves high-performance EM absorption with RL min of −59.47 dB and 4.1 GHz EAB at 1.5 mm. • The foam-based antenna exhibits a low .|S 11 | of −40.94 dB with excellent frequency selectivity. • The foam delivers stable electrochemical performance with a final capacitance retention of ∼77%. • The foam realizes the integration of EM wave absorption, wireless communication and electrochemical performance. With the rapid advancement of modern electronic information, defense technology and intelligent equipment, single-function electromagnetic (EM) materials fail to satisfy the comprehensive demands of complex application scenarios. Herein, a 3D porous magnetic MXene-based foam constructed from hollow Fe 3 O 4 (H–Fe 3 O 4 ) nanospheres, graphene oxide (GO) and MXene exhibits superior EM wave absorption performance. It delivers a minimum reflection loss of −59.47 dB and an effective absorption bandwidth of 4.1 GHz at a thin matching thickness of 1.5 mm. Moreover, the foam-based antenna achieves excellent multi-band frequency-selective performance covering S, C, X and Ku bands, with a low |S 11 | value of −40.94 dB at a substrate thickness of merely 0.13 mm. Additionally, the prepared foam possesses reliable electrochemical performance and thermal insulation capability. This work provides a new insight into the design and development of multifunctional materials and devices for complex practical scenarios. Download: Download high-res image (328KB) Download: Download full-size image