| Summary: | To solve the pollution problem of electromagnetic waves, new electromagnetic shielding materials should meet the requirements of being lightweight with high electrical conductivity. In this work, the combination of silver (Ag) nanoparticles and nitrogen doping (N-doping) was expected to tune the electromagnetic and physical properties of Ti<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i> MXene, and the Ag@N-Ti<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i> composites were fabricated through the hydrothermal reactions. The nitrogen doped (N-doped) Ag@Ti<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i> composites showed a hollow structure with a pore size of 5 μm. The influence of N-doped degrees on the electromagnetic interference (EMI) shielding performance was investigated over 8–18 GHz. Therefore, the controlled N-doping composites exhibited reflection-based EMI shielding performance due to the electrical conductivity and the special three-dimensional (3D) honeycomb-like structure. The achieved average EMI shielding values were 52.38 dB at the X-band and 72.72 dB at the K<sub>u</sub>-band. Overall, the Ag@N-Ti<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i> foam, due to its special 3D honeycomb-like structure, not only meets the characteristics of light weight, but also exhibits ultra-high-efficiency EMI shielding performance, revealing great prospects in the application of electromagnetic wave shielding field.
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