Electrostatic Self‐Assembly of <scp> Ti ₃ C ₂ T _x MXene </scp> /Cellulose Nanofiber Composite Films for Wearable Supercapacitor and Joule Heater

The titanium carbide nanosheets (MXene) hold great potential for fabricating high-performance electronics due to their two-dimensional layered structure, high electrical conductivity, and versatile surface chemistry. However, assembling the small MXene into flexible macroscopic films wearable still remains a challenge. Herein, we report hierarchical of cellulose nanofibers composite via an electrostatic self-assembly strategy induced by polyethyleneimine. Benefited from nacre-like microstructure “bricks” “mortars” interlocked polyethyleneimine hydrogen bonding interaction, possess integrated superior flexibility, tensile strength, stable which are advantageous electronic applications. To provide proof-of-concept design, symmetric quasi-solid-state supercapacitor with as-prepared film as electrode is fabricated, exhibits specific capacitance 93.9 mF cm−2 at current density 0.1 mA almost constant capacitive behavior under different bending states. In addition, possesses capacities electrothermal conversion complete degradation in peroxide solution. These results demonstrate that electrostatically self-assembled promise development highly flexible, mechanically robust, environmentally friendly energy storage devices.