Study On Anodic Oxidation And Oxygen Evolution Performance Of Ni-based Oxygen Evolution Electrode

New energy is one of the main drivers for the rapid development of society,hydrogen energy is a highly efficient,easy to store and environmentally friendly secondary energy source,has gradually become the most promising new energy source.At the same time,electrolytic hydrogen production is the simplest preparation method,the most efficient and non-polluting product,is currently the most widely used method of hydrogen production.The electrolytic water reaction is divided into the anodic oxygen evolution reaction and the cathodic hydrogen precipitation reaction,of which the oxygen evolution reaction is a 4-electron transfer process that can seriously affect the electrolytic water reaction process.Therefore,the development of efficient oxygen precipitation catalyst materials has become a major goal for researchers.In this study,three Ni-base binary alloy electrode materials with different compositions and different compositions were prepared by arc melting method,mainly using metal Ni,which has abundant reserves on earth and has good oxygen evolution performance.In order to improve the oxygen evolution performance of the electrode,the electrode was treated in potassium thiocyanate solution and acid solution,respectively,to optimize the coordination between the elements on the electrode surface and modify the microstructure of the electrode surface,and the microstructure characterization and oxygen evolution performance of the treated alloy electrode were analyzed.Ni-Fe binary alloy electrode prepared by arc melting method,the OER catalytic activity of Ni₂Fe₁ electrode was higher after electrochemical test.After dealloying in potassium thiocyanate solution,a layer of Fe-doped nickel hydroxyl oxide(Ni_xFe_（1-x）OOH)film was formed on the surface of Ni-Fe binary alloy electrode,which improves the oxygen evolution performance of the Ni-Fe electrode to a large extent.The OER catalytic activity of Ni-Fe binary alloy was also improved by acid surface roughening treatment,which increased the active surface area of electrode materials.Eventually,the ECSA of the Ni₂Fe₁ electrode increased to 5.775 cm² with good OER catalytic activity and an overpotential of 312.19 m V for a current density of 10 m A·cm^-2.The Ni-Co binary alloy electrode prepared by arc melting method,Ni₁Co₁ electrode showed excellent OER catalytic activity,due to the good conductivity of Co OOH generated by the reaction.The overpotential of Ni₂Co₁ electrode was reduced to 320.71 m V by dealloying the Ni-Co electrode in potassium thiocyanate.The acid surface roughening treatment also increased the active surface area of Ni-Co alloy electrode and improved the catalytic activity of the electrode.The lowest overpotential of Ni₁Co₁ electrode was 356.25mV.The Ni-Mo binary alloy electrode was prepared by arc melting method.The OER catalytic activity of the electrode increased with increasing Mo content,and the Ni₇Mo₃electrode showed good oxygen evolution performance with a minimum overpotential of401.42 m V.The Ni-Mo binary alloy electrode also increases the active surface area of the electrode by a factor of 5-10 after the acid treatment.The active surface area of Ni₇Mo₃ after anodic oxidation is 10.25 cm²,and the overpotential at a current density of 10 m A·cm^-2decreased to 306.47 mV with good OER catalytic activity.