Study On Preparation And Electrocatalytic Properties Of SnO₂-based Electrode

With the development of science and technology,industrial wastewater discharge is becoming more and more important,and pollution caused by organic compounds in wastewater is hard to dispose.So degrading organic compounds effectively are important.Ti-based Sb doped SnO₂ electrode?Ti/Sb-SnO₂?is prepared by pulse reverse current plating,electrodeposition method and screen printing,and its ability to degrade organic compounds is studied.The experimental results show that:The Ti/TNTs/Sb-SnO₂ electrode is prepared in the negative direction pulse?-60 mA,10 ms?,positive direction pulse?+8 mA,1 ms?,and intermittent time?0 mA,1 ms?on the basis of TiO₂ nanotubes.Compared with one-way pulses,the electrode has more dense and uniform surface morphology and better conductivity.The amount of Sb doped of coating is 8.6%?atomic fraction?.Its oxygen potential reaches 2.28 V.And the degradation rate of p-NP is 81%.Porous Sb₂O₄-SnO₂ electrode is prepared by electrodeposition on the basis of porous titanium.Electroplate the middle layer onto substrate for 15 min in the current density of20 mA/cm².Results show that the degradation rate of phenol is 97%and bath voltage is5.8 V after 90 min.SEM shows that morphology of the middle layer is spherical particles and it has a certain space structure;EDS analyzes that the amount of Sb doped of coating is 7.8%.Linear sweep voltammetry demonstrates 1.65 V of oxygen evolution potential,18 mA/cm² of current density,14.5?of electrode resistance and 251 h of enhanced life.The Ti/Sb-SnO₂-CNT electrode is prepared by screen printing(R_CNTs/SnO2=1/3?1/4?1/6?1/7?1/9?1/15).Results show that at heat treatment temperature of 500?,Ti/Sb-Sn O₂-CNT electrode(R_CNTs/SnO2=1/6)on phenol removal rate is much higher than the Ti/Sb-SnO₂ electrode,which has 2.47?,23 mA/cm² of current density,and its electrochemical performance is significantly higher than Ti/Sb-SnO₂ electrode.