Ultrathin Ni-Al layered double hydroxide nanosheets with enhanced supercapacitor performance

To improve electrochemical energy storage performance of Ni-Al layered double hydroxide (Ni-Al LDH) as supercapacitor electrode, ultrathin Ni-Al LDH nanosheets were prepared by simple hydrothermal method. The surface area of the ultrathin structure with broad pore size distribution is high to 64.9 m(2) g(-1). The ultrathin Ni-Al LDH nanosheets exhibit excellent pseudocapacitance performance with a maximum specific capacitance of 1919 F g(-1) and a capacity retention of 433 F g(-1) after 3000 cycles at a current density of 2 A g(-1). Furthermore, a reversible capacity of 1665 F g(-1) was obtained at a much higher current density of 30 A g(-1). The fascinating performances can be attributed to the improvement of pseudocapacitive reaction by the ultrathin structure of Ni-Al LDH. The impressive results may pave the way for promising applications in high energy density storage systems.