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Laminated Ti3C2Tx MXene has been considered as a promising absorbing material. However, microwave absorption (MA) performance of single Ti3C2Tx MXene is always limited. The introduction of magnetic components has been proven to improve impedance matching and MA performance effectively. In this paper, a novel CoNi@Ti3C2Tx composites with various CoNi loading were in-situ fabricated via a simple and low-temperature hydrothermal method. By introducing different contents of CoNi nanoparticles, the electromagnetic (EM) parameters of CoNi@Ti3C2Tx composites are regulated to enhance magnetic loss and improve impedance matching. The CoNi@Ti3C2Tx composites with 40 wt% CoNi nanoparticles showed a strong reflection loss of −58.18 dB at 13.20 GHz as the thickness is only 1.55 mm and a broad effective absorption bandwidth of 5.68 GHz can be achieved. The superior MA performance can be attributed to natural resonance, multiple scattering and reflection of the laminated structure, dipole polarization and interfacial polarization. This low-cost, energy-saving and simple method is significative for microwave absorption applications of MXene-based composite materials.

• Magnetic CoNi-alloy-decorated Ti 3 C 2 T x MXene were successfully prepared via mild hydrothermal method. • A broad absorption bandwidth of 5.68 GHz and strong reflection loss of −58.18 dB at 13.20 GHz were achieved in the CoNi@Ti 3 C 2 T x composite with the thickness of only 1.55 mm. • Tailoring microwave electromagnetic parameters and enhancing microwave absorption performance of the CoNi@Ti 3 C 2 T x composite by introducing different contents of CoNi nanoparticles. Laminated Ti 3 C 2 T x MXene has been considered as a promising absorbing material. However, microwave absorption (MA) performance of single Ti 3 C 2 T x MXene is always limited. The introduction of magnetic components has been proven to improve impedance matching and MA performance effectively. In this paper, a novel CoNi@Ti 3 C 2 T x composites with various CoNi loading were in-situ fabricated via a simple and low-temperature hydrothermal method. By introducing different contents of CoNi nanoparticles, the electromagnetic (EM) parameters of CoNi@Ti 3 C 2 T x composites are regulated to enhance magnetic loss and improve impedance matching. The CoNi@Ti 3 C 2 T x composites with 40 wt% CoNi nanoparticles showed a strong reflection loss of −58.18 dB at 13.20 GHz as the thickness is only 1.55 mm and a broad effective absorption bandwidth of 5.68 GHz can be achieved. The superior MA performance can be attributed to natural resonance, multiple scattering and reflection of the laminated structure, dipole polarization and interfacial polarization. This low-cost, energy-saving and simple method is significative for microwave absorption applications of MXene-based composite materials. [ABSTRACT FROM AUTHOR]