Preparation And Performance Study Of Semiconductor Photoelectrode Based On Titanium Substrate

The development of cities and industries has rapidly improved people's living standards,and the risks of energy use and pollution accidents have affected humankind.Due to the complexity of the marine environment,seawater corrodes metals extremely.China has made important strategic decisions on situations where corrosion of metal materials impedes social and economic development.A photocathode environmental protection technology that uses light energy to cathodicly protect metal materials has attracted the attention of scientists.At the same time,the organic wastewater produced by the printing and dyeing industry has also caused huge environmental pollution,and the efficient and environmentally friendly treatment of printing and dyeing wastewater has received widespread attention.In recent years,photoelectric co-catalysis has emerged rapidly as an emerging catalytic technology.It adds an external circuit on the basis of conventional photocatalysis to promote the separation between photo-generated electrons and holes and improve catalytic efficiency.This article focuses on the preparation of new photoelectrodes and explores their potential applications for photocatalytic protection or photocatalytic degradation of wastewater.The main research contents are as follows:(1)Study on photocatalytic protection of Ti/TiO₂-Co₃O₄ electrode.Modification of Ti/TiO₂ electrode by impregnation method,basic characterization using XRD,SEM,EDS,XPS.The optimal conditions for photocathode protection were found by changing the content of Co₃O₄.The experimental results show that the nanotube structure has a large specific surface area.When the content of Co₃O₄ used for immersion is 0.3 M,its light absorption capacity is significantly enhanced,and the photocurrent density rises to 25?A/cm² and the OCP value decreases to-0.22 V,indicating that this electrode has the best photocathode protection effect.(2)Study on photo-cathode protection performance of Ti/TiO₂-Zn Co₂O₄ electrode.TiO₂nanowires were prepared on the basis of titanium sheets by hydrothermal method,and further Zn Co₂O₄ nanostructures were grown on the nanowires by hydrothermal method.Characterization was performed by XRD,SEM,EDS,i-t,OCP,Tafel,EIS and other methods.The experimental results show that when the zinc nitrate content is 1.0 mmol and the cobalt nitrate content is 2.0 mmol,the prepared electrode has better light absorption ability,and the separation effect of the photo-generated electron-hole pair is the best.The negative charge transferred to 304SS increases,so it has the best cathodic protection effect on 304SS.(3)Study on the protection performance of Ti/Co₃O₄-NiCo₂O₄ electrode photocathode.Co₃O₄ nanowires were first prepared by hydrothermal method,and then NiCo₂O₄ was synthesized by chemical water bath to modify the electrode.Electrochemical workstations were used for OCP,i-t,tafel,and EIS to characterize the photoelectric conversion ability of the electrode and the ability to protect the cathode.The results show that when the nickel nitrate is0.5 mmol and the cobalt nitrate is 1.0 mmol,the prepared electrode has the best cathodic protection effect,and the OCP value is-200 mV.(4)Study on degradation of dye wastewater by Ti/black TiO₂-C₃N₄ electrode.The TiO₂prepared by the electroplating method is calcined under a hydrogen atmosphere to form black TiO₂,and a Ti/black TiO₂-C₃N₄ electrode is further prepared by a hydrothermal method.The influence of C₃N₄ concentration on the catalytic performance of the electrode was studied.The experimental results show that when the melamine content is 2.0 g,the optimal degradation effect is achieved,the degradation rate is 85.2%,and after five degradation cycles,the degradation rate is 75.3%,indicating that the prepared electrode has good degradation effect and the repeatability is stable.(5)Study on degradation of dye wastewater by Ti/black TiO₂-C electrode.A Ti/black TiO₂-C electrode was prepared by the steps of electroplating,hydrogenation and hydrothermal.Characterization was performed by XRD,SEM,EDS,LSV,MS,EIS,PL and other methods.The effect of the concentration of sucrose on the photocatalytic performance of the electrode was investigated.The experimental results show that when the sucrose content is 0.005 g,the electrode has a higher current efficiency for forming hydroxyl radicals due to inhibiting the release of oxygen,and achieves the optimal degradation effect,with a degradation rate of 93.9%.After five cycles,it still has good degradation effect.The main purpose of this paper is to prepare electrodes to achieve the effects of photo-generated cathodic protection or photocatalytic degradation of organic wastewater.The prepared Ti/TiO₂-Co₃O₄,Ti/TiO₂-Zn Co₂O₄,Ti/Co₃O₄-NiCo₂O₄,Ti/black TiO₂-C₃N₄,and Ti/black TiO₂-C five electrodes are dedicated to improving the light absorption range and reducing photo-generated electron-air Recombination rate to achieve the goal.At present,photoelectrochemical technology is still in the stage of theoretical investigation,whether it is protection of metals or degradation of sewage has not been widely used in practice.We still need to work hard,but despite the difficulties,the prospects are bright.