Synergistic Integration of SrFeO 3 Nanoparticles With Exfoliated MXene (Ti 3 C 2 T
Zulfqar Ali Sheikh, Shahzaib Ali, Sayed Zafar Abbas, Dhanasekaran Vikraman, Faisal Shahzad, Doyoung Byun, Hyun‐Seok Kim, Sajjad Hussain, Jongwan JungABSTRACT
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 SrFeO 3 nanoparticles with Ti 3 C 2 T x and V 2 CT x MXenes via a straightforward mechanical mixing process. In this architecture, the SrFeO 3 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 Ti 3 C 2 T x @SrFeO 3 and V 2 C@SrFeO 3 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/SrFeO 3 heterostructure as a promising platform for high performance energy storage.