| Transition metal nickel-based or nickel-cobalt-based compounds have become widely studied pseudocapacitance electrode materials for supercapacitors due to their higher theoretical specific capacitance and redox activity.Oxygen-containing carbon materials have higher chemical stability and richer oxygen-containing functional groups,and can be combined with metal materials and show good compatibility,but the specific capacitance is not ideal.Therefore,it is an effective way to improve the electrochemicalperformanceofsupercapacitorstopreparea nickel-based/nickel-cobalt-based and oxygen-containing carbon material composite electrode material with high specific capacitance.Based on this,this article aims to improve the specific capacitance as the ultimate goal to effectively prepare the nickel-based/nickel-cobalt-based hydroxide and oxygen-containing coal heavy group composite electrode material.The microstructure and composition of the prepared composite materials were studied by SEM,TEM,XRD,XPS and other characterization methods.The electrochemical test of the composite electrode was carried out with the three-electrode system of the electrochemical workstation and the mechanism was discussed.The specific research process and conclusions are as follows:When the volume ratio of hydrochloric acid to nitric acid is 1:1,the heavy group HC is treated with mixed acid deashing,and acetone is added to change the type of oxygen-containing groups,and the oxygen-containing coal heavy group a-AHC is obtained.When the volume ratio of hydrochloric acid and nitric acid is 1:1,the heavy group HC is treated with mixed acid deashing,and acetone is added to change the type of oxygen-containing groups,and the oxygen-containing coal heavy group a-AHC is obtained.The a-AHC@Ni-OH composite material with spherical compact petal structure was synthesized by one-step hydrothermal method.The electrochemical performance of a-AHC can be adjusted by controlling the load quality and hydrothermal reaction temperature of a-AHC.When the mass ratio of a-AHC to Ni（NO3）2·6H2O is 30:400 and the hydrothermal reaction temperature is160°C,the electrochemical performance of the composite material is excellent,and the specific capacitance is 0.1 A·g-1Reached 823 F·g-1.In addition,when the assembled a-AHC-30@Ni-OH/NF//AC asymmetric capacitor has a power density of5765.5 W·kg-1,the energy density can still reach 25.63 Wh·kg-1.The a-AHC-20@Ni Co-OH composite material with spherical petal structure and spherical lint cotton structure was synthesized by one-step hydrothermal method.The amount of a-AHC added and the temperature of the hydrothermal reaction can affect its electrochemical performance.When the mass ratio of a-AHC to Ni（NO3）2·6H2O and Co（NO3）2·6H2O is 30:400:120,and the hydrothermal reaction temperature is160°C,the electrochemical performance of the composite material is excellent.It shows a higher specific capacitance of 1724 F·g-1at 0.1 A·g-1.After 1000 cycles,when the current density is 1 A·g-1,the capacitor still maintains 78.7%of its original capacitance.The assembled a-AHC-30@Ni Co-OH/NF//AC asymmetric capacitor achieves a high energy density of 56.9 Wh·kg-1at a power density of 34.94 k W·kg-1.The paper has 36 figures,11 tables,and 113 references. |
