Synergistic integration of CoVAl-LDH and Ti₃C₂T_x-MXene for enhanced asymmetric supercapacitor performance

The layered hydroxides are endowed with a large specific surface area that enables a massive utilization in super capacitors. However, they have low conductivity which confines the electrochemical response in the layered hydroxide (LDH). The proposed research involved a one-pot synthesis procedure based on hydrothermal approach in order to get a composite material made of Ti₃C₂T_x-MXene, Cobalt-Vanadium-Aluminum layered double hydroxide (CoVA1-LDH), and coated nickel foam. The combination of Ti₃C₂T_x-MXene and CoVAl-LDH composite material exhibited a good value of electrochemical activity (1938.45 F g⁻¹), which is 1 A g⁻¹ in a three-electrode system. With the use of 5000 charge discharge cycles, and a high rate of current density of 10 A g⁻¹, it retained 79.8% of the initial capacitance. Further, the fabricated Ti₃C₂T_x-MXene/CoVAl-LDH//AC apparatus achieved maximum energy density of 51.57 Wh kg⁻¹ at the power density of 800.0 W kg⁻¹. Following 10, 000 cycles of the cycling at 10 A g⁻¹, it demonstrated the good capacitance retention rate of 89.1% which indicates good cycling stability. Rational structural design may be considered an effective approach to enhance the properties of materials, and this article gives new insights into the structural design of MXene/LDH composites.