Self-assembled flexible Ti3C2T x MXene-based thermally chargeable supercapacitor

Abstract Thermally chargeable supercapacitors (TCSCs) have unique advantages in the collection, conversion, and storage of thermal energy, contributing to the development of new strategies for thermal energy utilization. 2D MXene materials are predicted to be highly promising new thermoelectric materials. Here, we report a self-assembled flexible Ti 3 C 2 T x MXene-based TCSC device, using prepared Ti 3 C 2 T x MXene as the capacitor electrode and a NaClO 4 /PEO gel as the electrolyte. We also explore the working mechanism of the TCSCs. The fabricated Ti 3 C 2 T x -based TCSCs exhibit an excellent Seebeck coefficient of 11.8 mV∙K −1 on average and maintain good cycling stability under various temperature differences. Demonstrations of multiple practical applications show that Ti 3 C 2 T x MXene-based TCSC devices are excellent candidates for self-powered integrated electronic devices.