涂液浓度对IrO2-Ta2O5/Ti阳极涂层形貌及电化学性能的影响

Effect of solution concentration on morphology and electrochemical performance of IrO2-Ta2O5/Ti anode

采用Ir与Ta的物质的量比为7:3,Ir和Ta的总浓度分别为0.20、0.25、0.30、0.35和0.40 mol/L的涂液,以热分解制备了IrO2-Ta2O5/Ti阳极。通过循环伏安法和极化曲线测试了涂层的电化学性能,通过扫描电微镜观察了涂层的表面形貌,通过强化寿命试验测试了涂层的耐腐蚀性能。结果表明,随着涂液浓度的升高,涂层的电化学活性有所提升,但泥裂状表面使得涂层加速失效。涂液中Ir和Ta的总浓度为0.25 mol/L时制备的阳极具有最优的电催化活性与寿命。

IrO2-Ta2 O5/Ti anodes were prepared by thermal decomposition at various total concentrations of Ir and Ta with an Ir-to-Ta molar ratio of 7:3.The electrochemical performance of the coatings were tested by cyclic voltammetry and polarization curve measurement,their morphologies were observed by scanning electron microscopy,and their corrosion resistance were examined by accelerated lifetime test.The results showed that the electrocatalytic activity of the coating was improved by increasing the solution concentration,but its corrosion resistance was decreased due to the mud-crack surface morphology.The coating obtained with 0.25 mol/L of total Ir and Ta had the optimal electrocatalytic performance and service life.