Deformation‐Induced Electrochemical Performance of Mo 2 C MXene ‐Natural Rubber Flexible Supercapacitor

In this work, we investigate a symmetric Mo 2 C MXene//natural rubber//Mo 2 C MXene flexible supercapacitor using a coupled electrochemical‐mechanical finite‐element framework in COMSOL Multiphysics, combining secondary current distribution, Nernst‐Planck ion transport, and Butler‐Volmer kinetics with a hyperelastic structural model. In this device, the electrode is made of Mo 2 C MXene and natural rubber as separator, maintaining mechanical flexibility and electrochemical stability. The natural rubber separator is impregnated with 1 M KOH electrolyte and the device's 0–0.6 V working potential window was established from a three‐electrode simulation of the Mo 2 C MXene electrode with reference to Ag/AgCl in 1 M KOH. The electrochemical performance is simulated under both bending and non‐bending conditions. At 1 A g −1 , the device delivers a specific capacitance of 12.50 F g −1 , and energy and power densities of 0.625 Wh kg −1 and 150 W kg −1 , respectively. Structural analysis indicates negligible deformation, while the mechanical soundness of the structure is shown by von Mises stress. Under the bending condition, the symmetric flexible supercapacitor exhibits deformation‐induced changes in ionic diffusion pathways, resulting in a specific capacitance of 11.25 F g −1 , an energy density of 0.5625 Wh kg −1 , and a power density of 150 W kg −1 at 1 A g −1 .