铱金属氧化物pH电极的表面修饰研究

采用离子选择性透过膜对铱金属氧化物pH电极进行表面修饰，提高了氧化物pH电极对氧化／还原性阴离子的抗干扰能力；研究了离子选择性透过膜修饰对电极的E-pH关系以及响应速度的影响；利用扫描电镜观察离子选择性透过膜的表面与截面孔径分布，优化了离子选择性膜的制备工艺；利用循环伏安法研究了氧化物电极在I^-溶液中的电化学行为；利用膜电位测定方法计算了膜内阴、阳离子透过系数t＋，t-，探讨了离子选择性透过机理。

Surface Modification of Iridium Oxide pH Electrode

The ion selective film of Nafion was used to modify the iridium oxide electrode, and it is found that the coated ion selective film on the electrode improves the resistance to the interference of oxidative/reductive negative ions. SEM was used to observe the pore size distribution on the surface and cross-section of the coated selective film on the electrode for the purpose of optimizing the preparation process of the film. Cyclic voltammetry experiment was carried out to study the electrochemical behavior of the Nafion-coated electrode. The ion selective mechanism is suggested based on the calculation of positive/negative ion transport coefficient, i. e. t+ and t-, using the method of film potential measurement.