Enhanced charge storage using in-situ grown NiGa-layered double hydroxide on V₄C₃T_x MXene for supercapacitor applications

Developing remarkable hierarchical heterostructures in nanocomposites is crucial for enhancing electrochemical performance. Heterostructures combining layered double hydroxides (LDHs) and MXenes garner considerable attention as key candidates in energy conversion and storage. By fusing conductive 2D MXenes with LDHs, the advantages of both materials are effectively harnessed. Herein, nickel gallium layered double hydroxide (NiGa-LDH) is in situ grown on the V₄C₃T_x MXene surface to form NiGa-LDH/V₄C₃T_x MXene (NGV) nanocomposite. The robust interfacial interaction and superior electronic connection between NiGa-LDH and V₄C₃T_x MXene nanosheet bolster structural stability, enhances electrolyte accessibility, and boost electrical conductivity, thus delivers a specific capacity of 268.85 mAh g⁻¹ for NGV-11 at 1 A g⁻¹. The fabricated NGV-11//AC device achieves an impressive energy density of 56.41 Wh kg⁻¹ at a power density of 800 W kg⁻¹ and exceptional cycling stability of 93.24 % retention after 5000 cycles. The results show that the synergistic interaction between NiGa-LDH and V₄C₃T_x MXene significantly improves the charge storage capacity in the nanocomposite. This study presents a simple and effective approach for designing vanadium-based MXene with LDH for high-performance supercapacitors.