不同方法制备的Ru-Ti-Ir-Ta/Ti四元涂层钛阳极的比较

Comparison of Ru-Ti-Ir-Ta/Ti Quarternary Coating Prepared by Different Techniques on Titanium Anodes

采用热分解法和Sol-gel法,制备了具有三明治涂层结构的Ru-Ti-Ir-Ta/Ti四元金属氧化物钛阳极。采用XRD和SEM方法分析了涂层的相组织结构特征,通过Tafel曲线和循环伏安曲线的测试研究并比较了涂层的电催化活性。结果表明,两种方法制备的阳极涂层相成分都以(Ir,Ta)O2和(Ti,Ru)O2金红石固溶体相为主。在热分解法制备的涂层中还存在单质金属钌。采用Sol-gel法制备涂层,其晶粒更为细小。采用热分解法和Sol-gel法制备的钛阳极涂层表面形貌有明显的不同,前者可见明显的"泥裂状"裂纹,后者呈碎石状。采用Sol-gel制备的钛阳极比热分解法制备的钛阳极具有更好的电催化活性和耐蚀性。

Ru-Ti-Ir-Ta/Ti quartemary metal oxide titanium anodes with sandwich coating structure were prepared by thermal decomposition and sol-gel method, respectively. The phases and micro-morphologies of the two coatings were investigated by means of XRD and SEM. The electrocatalytic activity of the coatings was studied and compared by Tafel curve and cyclic voltammetry curve. It is demonstrated that the main phases in the coatings prepared by different techniques are mainly rutile-type solid solution （Ir, Ta）O2 and （Ti, Ru）O2. Metallic Ru is found in the coating prepared by thermal decomposition. The crystals in the coating prepared by sol-gel are finer. The morphologies of the coatings by thermal decomposition and sol-gel are obviously different. The former is distinctly dry cracked-mud like, and the latter shows the detritus-type. The result indicates that the titanium anode prepared by sol-gel have the better electrocatalytic activity and corrosion resistance than that by thermal decomposition.