Self-assembly of nano/microstructured 2D Ti3CNTx MXene-based composites for electromagnetic pollution elimination and Joule energy conversion application

Two-dimensional (2D) MXene materials have potential applications in electromagnetic pollution elimination and energy conversion fields owing to their high carrier mobility , specific surface area and unique layered features. Here, we demonstrated a controlled self-assembly strategy to construct multifunctional nano/microstructured 2D Ti 3 CNT x MXene-based composites for efficient electromagnetic attenuation and Joule energy conversion application. The multiple compositions and novel architecture endowed the layered porous Ti 3 CNT x /Ni@C composites with enhanced electromagnetic wave absorption and EMI shielding performances. Notably, the optimized nanocomposites achieved a high-performance electromagnetic wave absorption with a low loading (8 wt%), a broad effective absorption bandwidth (5.4 GHz) and a strong absorption (−65.7 dB) at a thickness of only 1.5 mm. The high electromagnetic shielding efficiency reached 66.7 dB. The underlying mechanism of electromagnetic shielding and absorption was the synergistic effects among electronic transport, abundant interfacial/dipolar polarization, strong magnetic coupling and multiple reflections in the layered porous structure . In addition, the efficient Joule energy conversion with favorable flame-retardant and high infrared shielding versatility broadened the practical application range of Ti 3 CNT x /Ni@C composites in harsh environments. Therefore, this assembly strategy inspires the construction and application of the 2D Mxene-based composites to promote the development of energy conversion and green electromagnetic environments.