Abstract:

The dimensionally stable anode(DSA）has been developing quickly in recent years. The IrO₂+SnO₂/Sb₂O₃+SnO₂/Ti, IrO₂+Ta₂O₅/Sb₂O₃+SnO₂/Ti and IrO₂+SnO₂/Ti coated electrodes were prepared by the thermal decomposition method. The properties of the coated electrodes for oxygen evolution were studied by linear sweep voltammetry, electrochemical impedance spectroscopy and accelerated corrosion test. Pb and its alloy electrodes were also used in contrast experiment. Distribution of chemical elements and surface topography were observed by EDX and SEM. The effects of electrolytic result were investigated with the coated electrodes, Pb and its alloy electrodes as anode in electrolytic synthesis of succinic acid. The results showed that the cell voltage reduced by 0.5—0.7 V and current consumption of electrolysis decreased by almost 10% when the coated electrodes instead of Pb and its alloy electrodes were used in the electrolytic process. Based on the comparison of three coated electrodes, the SnO₂-Sb₂O₃ interlayer could improve the properties of the coated electrodes for oxygen evolution and the service life of the coated electrodes in H₂SO₄ solution. The IrO₂+SnO₂/Sb₂O₃+SnO₂/Ti electrode displayed favorable performance for oxygen evolution and the working life exceeded 1456 days as the SnO₂ replaced Ta₂O₅ in the active coating of electrode. Although cell voltage and current consumption of electrolysis were a little bit higher, IrO₂+SnO₂ coated electrode was more cost effective because of replacement of noble metal in active coating.

摘要：

通过热分解法制备了IrO₂+SnO₂/Sb₂O₃+SnO₂/Ti、IrO₂+SnO₂/Ti、IrO₂+Ta₂O₅/Sb₂O₃+SnO₂/Ti电极，通过线性伏安、电化学阻抗、强化寿命测试等研究了钛基涂层电极在1 mol·L^-1硫酸溶液中的析氧性能。采用EDX、SEM等考察了电极的表面元素分布和电极强化寿命测试前后的表面形貌；并将上述电极作为阳极，以铅合金电极为阴极应用于电合成丁二酸体系，考察不同阳极的选用对电解结果的影响。结果表明，钛基涂层电极比传统Pb及其合金电极具有更低的析氧电位，在电合成丁二酸体系中，其槽电压可降低0.5～0.7 V，节约直流电耗10％以上；同时电解产物丁二酸的电流效率高于95％。在