Effect Of Microstructure And Morphology Of Ti-based Antimony-doped Tin Oxide Electrode On Catalytic Performance

Electrochemical oxidation,as an effective water treatment,has received wide attention for a long time,especially in the field of synthetic dyes wastewater treatment.Due to its bio-refractory characteristics,ordinary biochemical treatment cannot achieve the purpose of effective degradation,while electrochemical oxidation technology shows excellent catalytic degradation capability.Furthermore,electrochemical oxidation has advantages of mild conditions,simple equipment and environmental compatibility.The anode material is the core of electrochemical oxidation technology,so researchers have carried out a wide range of theoretical and experimental research.However,most of the studies are still at the macroscopic level,and there are few studies on the influence of the microstructure and morphology of the materials on the catalytic performance.It is of great significance to study the effects of microstructure on the catalytic properties of anode materials.In this paper,different crystal structures and microtopography have been obtained through the modification of the catalytic layer composition and structure of titanium tin antimony electrode from three aspects:preparation method,multivariate doping and crystal plane regulation.Then,we analyzed the influence of them on electrochemical properties,catalytic degradation and energy consumption.A novel Ti/SnO₂-Sb-Fe electrode was prepared by precipitation-printing technique for the first time in this paper.We discussed the influence of preparation method on the crystal nucleation and growth of anode materials.Compared with the Ti/SnO₂-Sb-Fe electrode prepared by sol-gel method and electrodeposition method,the electrode prepared by precipitation-printing technique owned smaller nanoparticles?<10 nm?,a larger electrochemical porosity?44.8%?,a higher oxygen evolution potential?2.20 V?,better degradation and lower consumption.On this basis,the Ti/ATONPs-MWCNTs electrode was first prepared by screen printing method,while the microstructure and adsorption properties of MWCNT were successfully retained.The electrochemical impedance of Ti/ATONPs-MWCNTs was only 0.24?,which was 50%lower than that of Ti/ATONPs while the energy consumption is about 19%percent lower.In addition,the surfactant molecule CTAB was introduced to regulate the high-active crystal plane of SnO₂-Sb?ATO?crystals innovatively in this paper.The study confirmed that CTAB inhibited the growth of low-active crystal plane{110}and promoted the growth of high-active crystal plane{211}.In comparison with Ti/ATO,we concluded that the regulated growth of the crystal plane can improve the oxygen evolution potential by4%;increase the degradation ability by 9%in the case of degradation for 3 h and reduce the energy consumption by about 27%.According to the study,a new research method is proposed to improve the electrocatalytic degradation performance of antimony-doped tin oxide anode materials.