Hydrothermal synthesis of flower-like NiCo₂-LDH/MXene-Ti₃C₂ composites for high-performance capacitors

In this work, NiCo2-LDH/Ti3C2 composites have been grown directly on Ni foam using a one-step hydrothermal synthesis method. The combination of NiCo2-LDH nanosheets and MXene (Ti3C2) shows cooperative effect for supercapacitors with expressively enhanced electrochemical performances. The NiCo2-LDH/Ti3C2 electrode shows a relatively high areal capacity of 4.39 C cm(-2) at 5 mA cm(-2), even at 20 mA cm(-2); the areal capacity retention is 77.5% (3.41 C cm(-2)). In addition, a solid-state hybrid supercapacitor of NiCo2-LDH/Ti3C2//AC is assembled by using the material as the positive electrode. The device presents a high energy density of 6.08 mW h cm(-3) at a power density of 202.50 mW cm(-3) and retains 81.63% of its initial capacity after 10,000 cycles.