Synthesis And Electrochemistry Properties Of H₂O₂ Electrooxidation Catalyst

In recent years,environment-friendly pollution-free clean energy has attracted more and more attention.Through direct peroxide-peroxide fuel cell,the chemical energy in H₂O₂ is converted into electric energy,and the product of the reaction is only water and oxygen,which can achieve zero carbon emission and pollution-free in real sense.In this paper,using fiber cloth?towel?and nickel foam as electrode substrate,the catalytic electrode was prepared by impregnation and drying,thermal reduction and hydrothermal synthesis.The morphology and characterization of the electrode were studied by means of SEM,XRD and TEM.The catalytic properties of H₂O₂ for electrooxidation of H₂O₂ were studied by electrochemical measurements such as CV,CA,and EIS.The Co₃O₄/Towel electrode was prepared by simple impregnation and drying and high temperature reduction.The catalytic performance of H₂O₂ electrooxidation was tested.The experimental results showed that the Co₃O₄/Towel electrode had a certain catalytic performance for the electrooxidation of H₂O₂.When the concentration of H₂O₂ is 0.5mol·dm^-3,the concentration of NaOH is 3mol·dm^-3,and when the concentration is 0.5V,the electrooxidation current density can reach 210mA·cm^-2.At 0.5V and 20min test time,the current density remained stable at 155mA·cm^-2.According to Arrhenius equation,the activation energy of the reaction is 18.42kJ·mol^-1.NiCo₂O₄/Ni foam electrode was prepared on the foamed nickel substrate by simple hydrothermal method and heat treatment.The catalytic performance of H₂O₂ electrooxidation was tested.When the concentration of H₂O₂ was 0.4mol·dm^-3,NaOH concentration was2mol·dm^-3,the current density of Electrooxidation could reach 639 mA·cm^-2.During the1000s test time,when the potential is 0.3V,the oxidation current is stable at 367mA·cm^-2.According to Arrhenius equation,the activation energy of the reaction is 9.46kJ.mol^-1.Fe₂O₃/Ni foam electrode was prepared on foam nickel substrate by simple hydrothermal method,and the electrooxidation of H₂O₂ was studied for the first time using Fe₂O₃ as catalyst.At H₂O₂ concentration of 0.6mol·dm^-3and NaOH concentration of 4mol·dm^-3,when the potential is 0.5V,the current density of can reach 908mA·cm^-2.Under the 0.3V potential,the test time of 1000s was maintained at 463mA·cm^-2.According to the Arrhenius equation,the activation energy of the reaction is 5.41kJ.mol^-1.