Study On Preparation And Electrocatalytic Hydrogen Properties Of Cobalt Oxide/Nickel Foam Electrode

Energy,information and materials are the three cornerstones of the development of contemporary society,and energy is an important material basis forhuman activities.The utilization of non-renewable resources such as oil,coal and natural gas is the driving force for economic development.However,the limited global energy resources and the shortage of renewable energy have made the energy crisis intensify.And the use of fossil fuels will have a great impact on the environment,so it is urgent to develop renewable,clean new energy and high energy storage devices.Among them,hydrogen energy is clean,efficient and highly sustainable,which has attracted widespread attention.Supercapacitors are also the focus of researchers due to their high power density and long cycle life.In this paper,cobalt oxide/nickel foam electrode materials with low cost and high performance were prepared by hydrothermal method and electrochemical deposition method.Their composition,structure,hydrogen production and capacitance properties were analyzed and studied,mainly including the following two parts:1.The cobalt oxide/nickel foam electrode with hydrogen production and capacitance double properties was prepared by hydrothermal method.The effects of concentration,time and temperature on the electrochemical performance of CoO/NF electrode were investigated by adjusting the concentration of cobalt nitrate,reaction time and reaction temperature.The morphology,composition and properties of the samples were characterized by scanning electron microscopy,fourier transform infrared spectroscopy and other characterization instruments.In the three-electrode system,the linear sweep voltammetry curve?LSV?,the constant potential and electrochemical impedance spectroscopy?EIS?of the electrode were measured in the alkaline electrolyte to study its catalytic hydrogen production performance.The capacitance performance of the electrode was studied by cyclic voltammetry?CV?and constant current charge discharge?CP?tests.Through the hydrogen production performance and capacitance performance tests,the CoO-8h/NF electrode has a minimum overpotential of-169 mV cm^-2 and a Tafel slope is185.4 V dec^-1 at the current density of 10 mA cm^-2.After 14 hours of hydrogen production stability test,its activity has almost no loss.At a current density of 1 mA cm^-2,the specific capacitance of CoO-8h/NF electrode can reach 930 mF cm^-2.After 10000 charges and discharges,it shows good cycle stability.2.The cobalt oxide/foam nickel electrode was prepared by the electrochemical deposition with hydrogen production and capacitance double properties,by controlling the scanning speed,the number of deposition circles and the concentration of electrolyte prepared cobalt oxide/nickel foam electrode.The effects of scanning rate,scanning circle number and electrolyte concentration on the electrochemical performance of CoO/NF electrode were studied.The morphology,composition and properties of the samples were characterized by scanning electron microscopy,fourier transform infrared spectroscopy and other characterization instruments.In the three-electrode system,the linear sweep voltammetry curve?LSV?,the constant potential and electrochemical impedance spectroscopy?EIS?of the electrode were measured in the alkaline electrolyte to study its catalytic hydrogen production performance.The capacitance performance of the electrode was studied by cyclic voltammetry?CV?and constant current charge discharge?CP?tests.And at the current density of 10 mA cm^-2,the minimum over potential of electrocatalytic hydrogen production is-201 mV cm^-2,and the Tafel slope is 148 V dec^-1.After 13 hours of hydrogen production stability test,there was almost no loss of activity.The specific capacitance of CoO-2mM/NF electrode can reach 6 F cm^-2 at the current density of 1 mA cm^-2.After 5000 times of charging and discharging,the specific capacitance maintenance rate is 70%.