Synergistic Integration of SrFeO3 Nanoparticles With Exfoliated MXene (Ti3C2T x /V2CT x ) Nanosheets for High Performance Supercapacitors

Abstract

ABSTRACT The performance of supercapacitors is often limited by conventional electrode materials, which typically necessitate a compromise between energy density, power density, and cycling stability. While two‐dimensional MXenes offer high conductivity and surface area, their practical application is hindered by restacking and oxidative degradation. This study introduces a novel heterostructured composite designed to overcome these limitations. For the first time, we fabricate a porous, exfoliated network by integrating zero‐dimensional SrFeO3 nanoparticles with Ti3C2T x and V2CTx MXenes via a straightforward mechanical mixing process. In this architecture, the SrFeO3 nanoparticles fulfill a dual role: they inhibit MXene restacking and contribute significant pseudocapacitance via Faradaic reactions. The synergistic coupling between the conductive MXene scaffolds and the redox‐active nanoparticles yields exceptional electrochemical performance. The optimized Ti3C2T x @SrFeO3 and V2C@SrFeO3 electrodes achieve specific capacitances of 752 and 972 F g− 1, respectively, at 1 A g− 1, alongside excellent rate capability. Asymmetric supercapacitor devices assembled with these composites deliver high energy densities of up to 52.91 Wh kg− 1 and exhibit outstanding long‐term stability, retaining over 93.9% of their initial capacitance after 5000 cycles. This work establishes the MXene/SrFeO3 heterostructure as a promising platform for high performance energy storage.