High areal capacitance of vanadium oxides intercalated Ti ₃ C ₂ MXene for flexible supercapacitors with high mass loading

Abstract

Abstract Flexible all-solid-state supercapacitors (ASSSs) have caught the scientific attention to meet the explosive demand for portable and wearable electronic devices. However, it is difficult for flexible electrode materials to obtain a high areal capacitance at a high mass loading, which limits their commercial applications. In this study, vanadium oxide (V 2 O 5 ) nanoparticles are introduced into Ti 3 C 2 flakes with the aid of cetyltrimethylammonium bromide (CTAB). The intercalation of V 2 O 5 particles in the interlayer of Ti 3 C 2 establishes a hierarchical structure and facilitates the electrolyte penetration. As a result, the prepared CT-Ti 3 C 2 @V 2 O 5 composite electrode achieves a high areal capacitance of 2065 mF cm −2 at 3 mA cm −2 and superior active mass loading (15 mg cm −2 ). Meanwhile, over 93% capacitance is maintained after 6000 cycles at 18 mA cm −2 . The ASSS based on CT-Ti 3 C 2 @V 2 O 5 delivers a high areal capacitance of 477 mF cm −2 at 1 mV s −1 and exhibits stable performance at different bending states, which reaches to the advanced level for the ASSSs based on MXenes.