Synthesis And Supercapacitive Properties Of Nickel Cobalt Binary Metal Composite Electrode Materials

Supercapacitor is one of the most promising renewable energy storage systems.In recent years,the research on its energy storage mechanism and the synthesis of nanostructured electrode materials have attracted increasingly intensive attention of researchers.The specific capacitance of a pseudocapacitor is dozens of times that of a double-layer capacitor,due to the unique faraday pseudocapacitance properties of nano-materials including conductive polymers,metal oxides/hydroxides,and so on.With the development of the new generation of intelligent electronic technology,portable wearable energy storage devices have also attracted more and more attention.However,it is still a great challenge to designe superior mechanical properties electrode materials as well as high storage capacity.To this end,enormous efforts have been devoted to the fabrication of controlled desirable morphologie nanomaterials.This paper mainly focus on the synthesis and supercapacitive properties of nickel cobalt binary metal composite electrode materials,the microscopic morphology of composite materials was observed by SEM,the components and elements of electrode materials were characterized by XRD and XPS,the cyclic voltages,constant current charge and discharge,and AC impedance of ASC were tested using an electrochemical workstation.The following is the main content of the article.?1?Ni Co₂Fe-OH@g-C₃N₄electrode materials with good electrochemical properties were successfully prepared by hydrothermal method.In the three electrode systems,the composites showed high specific capacitance of 1550 F/g when the current density was 1A/g and 985 F/g when the current density reached 10 A/g,indicating that the composites have excellent performance.Asymmetric devices with Ni Co₂Fe-OH@g-C₃N₄//NF as the positive material and AC//NF as the negative material were fabricated and electrochemical characterization was investigated in 6M KOH electrolyte,which which delivered an energy density of 35 Wh/kg at power density of 701 W/kg.The device demonstrated a high specifific capacitance of 129 F/g at current density of 1 A/g,and it retains capacitance retention ratios 93.6%after 1500 charge/discharge cycles,indicating that the ASC has good cycling stability.Two ASC devices in series can easily light up LEDs,indicating that Ni Co₂Fe-OH@g-C₃N₄composites have great potential as electrode materials supercapacitor application.?2?The flexible carbon cloth?CC?substrate was activated and Zn O nanorod arrays were successfully grown on the surface of CC by a hydrothermal method,which could not only increase the specific surface area of the material,but also enhance the loading of active substances.Then,CC/Zn O/3D Ni composites were synthesized by using electrochemical deposition technique to directly generate 3D Ni particles on the Zn O surface,and the specific capacity of the material could reach 177 F/g at current density of 1A/g in a three-electrode systems,the result is significantly higher compared to previous studies on related materials.The excellent capacitive behavior was ascribed to the transition metal elements on the surface of the nanorods,which could provide more active sites as well as increasing the electrical conductivity of the materials.