Preparation And Performance Of Transistion Metal-based Catalysts For Antifouling By Direct Electrolysis Of Seawater

As the use of seawater increases,the problem of marine biofouling during the extraction process becomes more obvious.Direct electrolysis of seawater to generate available chlorine is a commonly used antifouling method,and its applications limited by high cost,poor stability and low selectivity of the anode material.Therefore,it is urgent to develop catalytic materials with low cost,high stability and high selectivity.In recent years,modification methods such as changing the intrinsic activity of catalysts（heterostructure,heteroatom doping,defect engineering）,improving the active sites of catalysts（single-atom catalysts,two-dimensional nanomaterials,nanomaterials）and improving matrix conductivity have been widely studied.Based on the above three modification methods,non-noble metal-based supported electrocatalysts were prepared,and the feasibility of Chlorine Evolution Reaction for in-situ sterilization and antifouling was studied.1.To investigate the effect of the degree of exposure of the active site on the catalytic performance by varying the specific surface area of the catalyst.The ZIF-67precursor was prepared and the Co₃O₄-X catalyst was obtained by changing different sintering temperatures.Dispersed on a highly conductive carbon cloth（CC）substrate to obtain electrode CC/X.The experimental results show that the potential increases to1.225 V to 1.258 V（vs.Ag/Ag Cl）at a current density of 10 m A·cm^-2 in neutral seawater,and the Faraday efficiency>80%.2.Based on the defect effect,an oxygen-rich vacancy x wt%Ni-Co₃O₄ catalyst was prepared.Doping with different concentrations of Ni can change its local electronic structure,reduce the activation energy of reaction intermediates,and improve the catalytic activity.The experimental results show that 10.00 wt%Ni-Co₃O₄/CC electrode has high selectivity and stability in neutral seawater.3.Based on the idea of in-situ sterilization and antifouling,long-term sterilization experiments are carried out by electrolysis of electrode 10.00 wt%Ni-Co₃O₄/CC in seawater to verify its feasibility.The experimental results show that the electrode 10.00wt%Ni-Co₃O₄/CC has good bactericidal and antifouling effect in neutral seawater.Verified by plate counting method,biofilm fluorescence staining and corrosion weight gain experiments.