Flexible MXene–cellulose nanofiber based all-solid-state supercapacitors with high volumetric capacitance

. The electrochemical properties also showed no degradation in bending tests in the range of 30°-120°. The capacitance retention was 97.87% after 10 000 bending cycles at an angle of 60°. This work provides a scalable and green approach to fabricating high-performance MSCs and points the way to the next generation of wearable electronics.