热氧化制备的钯氧化物电极的组成与pH敏感性能

Composition and Sensitivity to pH of Palladium Oxide Electrodes Prepared by Thermal Oxidation

用钯氧化物电极作pH敏感元件已引起人们的兴趣,但对其性能及其与制备条件的关系仍缺乏了解。本文着重讨论热氧化制备的钯氧化物电极的组成和pH敏感性能同氧化温度的关系。 1 实验条件与方法 直径0.3mm的钯丝经丙酮除油、浓硝酸处理(30 s)、蒸馏水冲洗和晾干后。

Thermal oxidation of Pd in air was studied by thermogravimetric analysis. The composition and properties of the palladium oxide electrodes prepared at different temperatures were characterized by using XPS and electrochemical methods. It is found that the pH response of these electrodes depends strongly on the preparation temperature, and Pd(Ⅳ ) oxide is essential to a better pH respone. The pH-sensing mechanism .was also discussed.