Layer-by-Layer Assembled Flexible MXene/TiS₂ Composite Films for Thermoelectric Applications

MXene has great potential in the application of thermoelectric materials due to its high conductivity, but its application in this field is limited by the low Seebeck coefficient. In this work, a laminated composite film with a regular 2-dimensional heterogeneous interface was constructed by using 2-dimensional MXene and TiS₂. The results show that the sandwich structure composite film has a high Seebeck coefficient (−80.4 μV K⁻¹) while maintaining a high electrical conductivity (322.12 S cm⁻¹). The power factor of the sandwich structure film is higher than that of the disordered structure film, which is 22 times that of the Ti₃C₂T_x film. The simple flexible device prepared by MTM film has an ideal power density (26.6 W m⁻²) at a temperature difference of 70 K. This work provides strong evidence and feasible reference for optimizing and improving the thermoelectric properties of MXene-based materials by using high-quality heterostructures.