Journal
INORGANIC CHEMISTRY COMMUNICATIONS
Volume 145, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.inoche.2022.110027
Keywords
Nanosheets; Assembly; Electrochemical performance; Supercapacitors
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A Co-Al layered double hydroxide/titanium dioxide (Co-Al LDH/TiO2) nanocomposite was successfully fabricated by electrostatic assembly. This nanocomposite structure significantly improved the electrochemical performance, leading to enhanced specific capacitance and good cyclic stability. When used in a solid-state asymmetric supercapacitor, the Co-Al LDH/TiO2 nanocomposite served as the positive electrode and showed excellent capacitive behavior.
A novel Co-Al layered double hydroxide/titanium dioxide (Co-Al LDH/TiO2) nanocomposite is fabricated by the electrostatic assembly of Co-Al LDH and TiO2 nanosheets from exfoliation. The layer-by-layer nanocomposite structure effectively improves the electrochemical performance by providing abundant utilization of active sites and facilitating rapid ionic/electronic transport. The Co-Al LDH/TiO2 electrode exhibits an enhanced specific capacitance of 611.4 F g-1 at a current density of 10 mA cm-2 and good cyclic stability (81.4% capacity retention after 2000 cycles) compared with Co-Al LDH. A solid-state asymmetric supercapacitor is prepared from the Co-Al LDH/TiO2 as positive electrode and active carbon as negative electrode. The Co-Al LDH/TiO2//AC retains 92.7% initial capacitance and 94.1% coulombic efficiency after 2000 cycles at 20 mA cm-2. The Co-Al LDH/TiO2 nanocomposite is a promising electrode material for the supercapacitors.
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