The Preperation Of CuNiS/porous Anodic Nickle Oxide Self-supported Electrode For Hydrogen/oxygen Evolution Reaction

The exploitation and use of fossil energy have aggravated the ecological environment and energy problems.People are eager to find new renewable energy sources to substitute traditional fossil fuels in order to lessen or resolve the issues of energy scarcity and severe environmental pollution and to accomplish energy efficiency,emission reduction,and sustainable development.Due to its non-polluting and renewable byproducts,hydrogen is the most hopeful new energy source.Therefore,it has become fashionable to research ways to create hydrogen that are inexpensive,clean,and require little energy.It is anticipated to displace current fossil fuel sources of energy and establish itself as a popular,large-scale technique for producing hydrogen.There are two kinds of electrode materials commonly used in electrolytic water:powder and self-supporting electrode.The powder material is often loaded on the current collector by binder,which leads to the disadvantages of easy shedding and increase of contact resistance.The self-supporting material avoids the use of binders to improve stability and reduce contact resistance,and is able to participate in the reaction itself without the need for additional nickel sources.In this project,precursors were prepared by anodic oxidation,an in-situ method.In order to control the morphology of the nickel foil during anodic oxidation,the pretreatment method,anodic oxidation electrolyte,oxidation time,oxidation voltage and other factors were regulated and optimised,respectively,resulting in the formation of both lamellar and porous（spongy）structures on the surface of the pure nickel foil,and the generation of small amounts of nickel hydroxide and nickel fluoride,increasing the specific surface area of the nickel substrate,increasing the active sites making the HER and OER overpotentials The OER performance is even comparable to the nickel foam.The electrochemical performance of the electrode was further enhanced by depositing copper-nickel bimetallic sulphides on the surface of the ANO precursor through a chemical bath deposition method using nickle foil as the sole nickel source,Cu Cl₂?2H₂O as the copper source and CH₂CSNH₂ as the vulcanising agent.XRD and XPS can determine that a bimetallic sulphide consisting of Cu S and Ni S₂ was generated on the surface of the ANO.Increasing the active site and improving the active area reduces the electrode’s hydrogen and oxygen precipitation potential,avoids using a binder,and gives a good bonding between the deposited layer and the substrate,resulting in better stability.During the study,it was found that acetic acid as a complexing agent had a significant effect on the electrochemical performance of Cu Ni S/ANO since acetic acid can also increase the concentration of S^2-by maintaining the p H,which induces the formation of Cu_xS,and when the amount of acetic acid added varies,it has an effect on the amount of copper sulphide produced,which in turn affects the electrochemical performance;in addition to this it was also investigated that the Cu Cl₂?2H₂O concentration influenced the performance and morphology of Cu Ni S/ANO,It was discovered that the Cu²⁺content significantly affected the deposit’s morphology,particularly its particle size,which changed the catalyst’s comparative area and,in turn,its electrochemical performance.The correlation between the two key variables,deposition time and deposition temperature,and the nucleation process during deposition was investigated from performance to morphology.The final Cu Ni S/ANO electrode had HER overpotential of 86 m V(j=-10 m A?cm^-2)and an OER overpotential of 315 m V(j=10 m A?cm^-2),and a constant current density of-10 m A?cm^-2 at a constant voltage and no significant decay was observed over 50 hours,indicating that the catalyst also has good electrochemical stability;and used the Cu Ni S/ANO electrode as cathode and anode and tested in 1 M KOH（aq）for water splitting,when the current density reached 10 m A?cm^-2,the overpotential was 1.64V（vs.RHE）,the Cu Ni S/ANO electrode has good catalytic activity as a bifunctional catalyst.