Synergistic engineering of NiAl-LDH@Ti3C2Tx heterostructure enables superior asymmetric supercapacitor

We present the rational design of a nanostructured Ti₃C₂Tₓ-MXene@NiAl-layered double hydroxide (NiAl-LDH) hybrid electrode prepared via an in situ growth strategy. Uniform deposition of nanoscale NiAl-LDH on few-layer Ti₃C₂Tₓ-MXene formed a robust interfacial structure with strong electronic coupling. DFT calculations and electrochemical analyses reveal enhanced conductivity, faster ion transport, and improved structural stability. As a result, the electrode delivers a high specific capacitance of 1570.1 F g −1 at 1 A g −1 and retains 92.8% capacitance after 5000 cycles at 10 A g −1 . An asymmetric supercapacitor using the NiAl-LDH@Ti 3 C 2 T x cathode and an activated carbon anode in 1 M KOH operates up to 1.6 V, achieving 62.8 Wh kg −1 at 1500 W kg −1 and maintaining 90.2% capacity retention with nearly 100% coulombic efficiency over 5000 cycles. Overall, this work demonstrates that NiAl-LDH@Ti 3 C 2 T x hybridization effectively balances energy density and durability, offering a scalable route for advanced electrochemical energy storage.