Yeo In-Hyeong, Wen Sun, Mho Sun-il
Department of Chemistry, Dongguk University, Seoul 100-715, Korea.
Anal Sci. 2010 Jan;26(1):39-44. doi: 10.2116/analsci.26.39.
The electrochemical activities of PbO(2) thin-film electrodes were systematically studied with an oxygen-transfer reaction, i.e., the oxidation of thiourea. Five different types of PbO(2) film electrodes were prepared using various methods to investigate the influence of the interfacial oxide layer formed between the Ti substrate and the PbO(2) layer contacting the electrolyte. Among the electrodes tested, PbO(2) electrode prepared by minimizing the formation of the interfacial oxide by either the electrochemical or thermal decomposition method generally exhibited better electrochemical activity. From the results, it can be inferred that the enhanced electrochemical activity of the electrode is due to minimization of the interfacial resistance by the introduction of a metallic Pb layer between the Ti substrate and the PbO(2) layer, and to an increase in the roughness on the surface of the PbO(2) layer.
通过氧转移反应（即硫脲的氧化反应），系统地研究了PbO₂薄膜电极的电化学活性。采用多种方法制备了五种不同类型的PbO₂薄膜电极，以研究在Ti基底与接触电解质的PbO₂层之间形成的界面氧化层的影响。在所测试的电极中，通过电化学或热分解方法将界面氧化物的形成减至最少而制备的PbO₂电极通常表现出更好的电化学活性。从结果可以推断，电极电化学活性增强的原因是在Ti基底和PbO₂层之间引入金属Pb层使界面电阻最小化，以及PbO₂层表面粗糙度增加。
