IrO₂-Ta₂O₅氧化物涂层钛阳极具有良好的电催化活性与电化学稳定性，被公认为酸性析氧环境中理想的阳极材料，但其低寿命、高成本制约了在电镀、废水处理、阴极保护与有机电合成等领域的广泛应用。论文分析了电解铜箔用涂层钛阳极的失效机制，探究了材料组分、制备工艺及中间层对涂层钛阳极微观组织和电催化活性的影响，为阳极的工业化应用提供理论基础和依据。主要研究内容及结论如下：

(1)失效钛阳极的的宏观组织较为均为，微观上失效程度不同，涂层表面形成的阳极泥主要成分为Pb及其化合物。失效钛阳极的催化活性小于新的钛阳极，其原因在于涂层钛阳极中活性成分IrO₂含量减少，导致涂层与溶液之间阻抗增大；钛基体发生钝化形成不导电的TiO₂，导致涂层内表面与基体之间物理阻抗增大。此外，新钛阳极电解铜箔表面较为平整，光面及毛面粗糙度均小于失效钛阳极电解铜箔，其力学性能(抗拉强度、延伸率)优于后者。

(2)烧结温度升高，涂层钛阳极表面更为平整、龟裂纹较小、晶化程度更高，意味着其阻抗降低和催化活性的提高；随着Ir含量的升高，涂层钛阳极的的Rct值减小，寿命成线性逐渐增加。

(3)添加蚀刻和TiO₂中间层后，涂层钛阳极中IrO₂和Ta₂O₅的晶面结晶度发生转变。同时，中间层的加入虽造成了涂层钛阳极的循环伏安曲线面积的减小和阻抗的增大，但更加粗糙的表面基体与涂层之间的结合力，延缓了服役过程中涂层钛阳极的脱落，延长了其使用寿命。

Titanium anodes coated with IrO₂-Ta₂O₅ oxide have good electrocatalytic activity and electrochemical stability, which are considered ideal anode materials in an acid-oxygen evolution environment. In this paper, the failure mechanism of coated titanium anode for copper foil electrolysis is analyzed, and the material composition, preparation process, and mesostructure of the anode are discussed. The main research content and conclusions are as follows:

(1) Through the analysis of the oxide-coated titanium anode used for the failure electrolytic copper foil, it is found that the macrostructure of the failed titanium anode is relatively uniform, and the failure degree is different in microcosmic. The main components of anode slime on the coating surface are Pb and its compounds, while the crystalline grains with poor crystallinity are easy to fall off and dissolve. Compared with the newly coated titanium anode, the area of the cyclic voltammetry curve of the failure-coated titanium anode is smaller than that of the new-coated titanium anode. In addition, the surface of electrolytic copper foil with the new titanium anode is smooth. The roughness of the smooth surface and the rough surface are less than that of the failed titanium anode electrolytic copper foil. Its mechanical properties (tensile strength, elongation) are better than the latter.

(2) With the increase of sintering temperature, the surface of coated titanium anode is more smooth, the cracks are smaller and the degree of crystallization is higher, which means that the impedance is lower and the catalytic activity is higher; with the increase of Ir content, the Rct value of coated titanium anode decreases, and the accelerated failure life is linearly and gradually increased.

(3) With the addition of etching and TiO₂ interlayer, the crystallinity transformation of IrO₂ and Ta₂O₅ is obvious. At the same time, the adhesion between the coating and the substrate on the coarser surface of the coated Ti anode was delayed, and the service life was prolonged.

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