Synthesis of exfoliated titanium dioxide nanosheets/nickel-aluminum layered double hydroxide as a novel electrode for supercapacitors

摘要

A facile composite of titanium dioxide nanosheets/nickel-aluminum layered double hydroxide (TiO2/Ni-Al LDH) is fabricated successfully as the electrode material for supercapacitors. The results of scanning electron microscopy and transmission electron microscopy reveal that Ni-Al LDH platelets homogeneously grow onto the surfaces of the TiO2, keeping the neighboring sheets separate. The composite exhibits higher specific capacitance (744.5 F g(-1) at a current of 10 mA cm(-2)) than Ni-Al LDH (519.5 F g(-1) at a current of 10 mA cm(-2)) and 70.7% retained specific capacitance after 4000 cycles in three-electrode system. The unique structure is beneficial for electrode materials because of its sufficient utilization of laminates and high efficiency of transmission for both electrolyte ions and electrons.