Study On Electrocatalysis Ability Of Sm³⁺ Doped Ti/SnO₂-Sb Electrodes

Dimension Stable Anode（DSA） electrode has been gotten a lot of attention andapplied widely in the industrial fields since it has been discovered because of stable size,well causticity and longer life. To satisfy different industrial demands, the electrode coatingneed to be modified. Nowadays, electro-catalytic oxidization properties of DSA is a studyhotspot in treatment of contained organic waste water. Catalytic-capability of the rare earthprovides a new chance for the DSA. The electrode coating doped with rare earth canimprove the stability and electrical catalytic properties. To study the influence on electrodecoating doped with rare earth, the Sm³⁺doped Ti/SnO₂-Sb electrode was prepared by thethermal decomposition method. The electrochemistry capability, the micrograph of theelectrode surface, the electro-catalyse capability, and the electrode life were analyzed. Theeffects of the doping amount of metal ions and heat treatment temperature on the electrodeproperties were discussed in this thesis.1. The Ti/SnO₂-Sb electrodes were prepared by the thermal decomposition methodunder the condition of different Sb doping amount and calcining temperature, usingSnCl4·5H2O and Sb₂O₃as raw materials and the titaniun plate as basal body. The surfacecoating of electrodes were analyzed by SEM. The electrochemical performance of theprepared electrodes were evaluated by linear sweep voltammetry（LSV） and Tafel curves.The degradation ability of the electrodes was investigated using p-nitrophenol as a targetorganic. The results show that the Sb doping can improve performance of the electrodes.The optimal technological conditions were determined as: calcining temperature,550℃andSb doping amount,10%. The electrode prepared under optimal conditions has bettercoveragel and electro-catalysis ability. Degradation efficiency of electrode forp-nitrophenol is up to75.4%and using life is28.5hours.2. The Ti/SnO₂-Sb electrodes were prepared by the thermal decomposition methodunder the condition of different Sm³⁺doping amount and calcining temperature, usingSnCl₄·5H₂O,Sb₂O₃and Sm₂O₃as raw materials and the titanium plate as basal body. Theelectrochemical performance of the prepared electrodes was evaluated by electrochemicalsystem. The micrograph and the element composition of the electrodes’ surface coatingwere analyzed by SEM and EDS. The results show that:right amount of Sm³⁺doping canimprove performance of the electrodes. The optimal technological conditions were calcining temperature550℃and Sm³⁺doping amount1%. Under the optimal conditions,the electrode prepared has better coverage,higher oxygen evolution potential（1.72V）, bigerexchange current density value(2.79×10^-4mA·cm^-2), and degradation efficiency ofp-nitrophenol is88%, using life is68.9hours, longer1.4times than that of no Sm³⁺doping.