• 作者： Shieh, Deng-Tswen; Hwang, Bing-Joe
• 中文摘要： 本文藉由接觸角、表面形態及電化學特性來研究PTFE修飾二氧化釕電極在氧氣析出的疏水性效應。PTFE修飾二氧化釕電極的疏水性是由接觸角度計來量測,電極的表面形態是由電子顯微鏡及原子力顯微鏡來觀察,電極PTFE含量在電化學特性之效應則是由伏安電量、極化行為及交流阻抗來量測。結果顯示氧氣析出行為及電極的效能明顯受到電極疏水性影響,在低過電位時以含11.1vol% PTFE塗膜液製備得之電極有最高的析氧活性位址數目及位址活性,其析氧效能最好; 高過電位時則以20vol% PTFE塗膜液製備得之電極有最高之位址活性。由交流阻抗分析指出高PTFE含量的電極因膜阻力較大會阻礙電極水合的進行且膜的阻力較大。
• 英文摘要： The hydrophobic effects of PTFE-modified RuO/sub 2/ electrodes for oxygen evolution were explored in this study from the investigations of contact angle, morphology and electrochemical characteristics . The hydrophobicity of electrodes was measured by the contact angle, cyclic voltammetry and acimpedance of PTFE-modified RuO/sub 2/ electrodes. The morphologies of electrodes with various amount of PTFE were observed by using of SEM and AFM. The effects of PTFE-content on the electrochemical characteristics of PTFE-modified electrodes were carried out by the measurements of voltammetric charge, polarization and ac-impedance. The behavior of oxygen evolution and the performance of electrodes depended significantly on the hydrophobicity of PTFE-modified electrodes, and the electrode prepared from a dipping solution with 11.1vol% PTFE had the best performance, i.e., the largest number of active sites and the highest site activity at low overpotential. The electrode prepared from a dipping solution with 20vol% PTFE behaved the highest site activity at high overpotential. The facts that electrodes with higher PTFE-content retarded hydration of the electrode and processed a larger film resistance were also found, as indicated from the ac-impedance analysis, in this study.
• 中文關鍵字： 二氧化釕; 疏水性; 電極; 鹼; 氧
• 英文關鍵字： Ruthenium Oxide; Hydrophobicity; Electrode; Alkaline; Oxygen