Ir／IrOx金属氧化物电极的H^＋响应行为研究

The Investigation of H+ Response Characteristic of Ir/IrOx Metallic Oxide Electrode

摘要:

通过热氧化法制备了铱氧化物电极，研究了电极的各种H^ 响应行为：电极响应开路电位与溶液pH值的线性关系、响应范围、响应速度、滞后效应。分别利用循环伏安法SEM、XPS对铱氧化物电极的内外表面组成、表面形貌与元素价态进行了分析。根据建立的内、外表面电荷积分模型分析了电极H^ 响应速度、滞后效应和氧化膜厚度、形态的关系，提出了水合氧化膜存在下的H^ 响应机理。

关键词:铱 氧化物 电极 H^＋

Abstract:

Many H+ response characteristics of Iridium oxide electrode were described in this paper. The linear relationship between open-circuit potential and pH value, decisive factors to response rate were studied in detail. The hysteresis effect were also investigated, furthermore, many determination technologies, such as cyclic voltammetry, SEM, XPS were used to analyze the element valence and composition or to decide the rate of inner and outer surface, as well as to observe the morphology of the oxide film, from which the relationship between hysteresis effect and film thickness as well as morphology was discussed, finally, the response mechanism of the hydrous iridium oxide electrode were suggested.

Key words:iridium,oxide,electrode,H+