Hierarchically porous cobalt aluminum layered double hydroxide flowers with enhanced capacitance performances

摘要: A facile and cost-efficient synthesis approach toward hierarchically porous cobalt aluminum layered double hydroxide with hydrangea flower-like morphology (PCALs) is developed in this work via the hydrothermal treatment of cobalt- aluminum-containing precursors under basic conditions following etching NaOH. The architectures porosities obtained PCALs can be easily modified by fabrication such as concentration starting materials time etching, which further influence their electrochemical behavior. As electrode material a three-electrode supercapacitor, deliver high capacitance 550 F g−1 for 1000 cycles retention rate over 82% at 10 g−1. In addition, asymmetric capacitor using cathode active carbon anode also exhibits an excellent 103.5 0.5 g−1, indicating potentials applications energy storages.