Preparation And Electrochemical Property Of CuCo₂O₄/NiCo₂S₄ Nansphere Electrodes

Supercapacitors have attracted wide attention due to their good energy storage properties,mixed transition metal oxide.Among them,mixed transition metal oxides,compared to single metal oxide,have better cycle stability and higher conductivity,therefore,are considered ideal supercapacitor electrode material.However,the low specific capacity of mixed metal oxide alone limits the actual energy storage effect.In order to overcome the disadvantages of the above materials,the electrochemical properties of the electrode material are optimized from the composition and structure of the electrode material.Among them,the sea urchin-shaped double-metal copper-cobalt oxide CuCo₂O₄nanosphere has high stability and electrical conductivity,and is considered as an ideal substrate material.Sulfur-cobalt-nickel can contribute to the electrical capacity due to its excellent redox behavior.By changing its microstructure and ingenious composite method,a multi-dimensional structure was designed using CuCo₂O₄nanospheres similar to sea urchins and CuCo₂O₄/NiCo₂S₄nanospheres composited with scaly sulfur-cobalt-nickel.（Ⅰ）First,sea urchin CuCo₂O₄nanospheres grown on nickel foam were made by means of hydrothermal and high temperature calcination,3 M KOH was used as electrolyte in the three-electrode system.At the 1 A g^-1current density,the specific capitance of the sea urchin CuCo₂O₄electrode was 715.0 F g^-1.At the same time,the sea urchin copper cobalt oxide electrode also has good cycle stability,constant flow charge and discharge cycle after 3 000 times than to maintain a good capacitor and slightly increased（106.0%）,this material has a high specific capacitance and good cyclic stability,which can be attributed to the sea urchin-like structure with a large active area that allowed to diffuse the electrolyte ions more efficiently on the surface.The high-performance electrodes with a unique sea urchin-like structure prepared in this experiment are expected to be more widely used in the field of energy storage.（Ⅱ）Using the electrodeposition method,the electrolyte containing cobalt nitrate,nickel nitrate,and thiourea was also electrodeposited by using a three-electrode system at a sweep speed of 5 mv s^-1,different complexes were obtained by controlling the cycle of electrodeposition,and the products obtained after 1,3 and 5 cycles were CuCo₂O₄/NiCo₂S₄-1,CuCo₂O₄/NiCo₂S₄-3,and CuCo₂O₄/NiCo₂S₄-5.In the 3 M KOH electrolysis,the CuCo₂O₄/NiCo₂S₄-3 showed a higher specific capacity of 2284.2 A g^-1at a current density of 1 A g^-1,compared with CuCo₂O₄/NiCo₂S₄-1 and CuCo₂O₄/NiCo₂S₄-5 also show better cycle stability,because the Co ions and Ni ions in sulfur cobalt-nickel contribute to the electrochemical reaction,the compound has a greater active surface area and more active substances to improve the capacitive performance.