Hydrophobic effect of PTFE‐modified Ru_0.3Ti_0.7O₂electrodes on oxygen evolution in alkaline solution

Abstract

The hydrophobic effects of PTFE-modified Ru 0.3 Ti 0.7 O 2 electrodes on oxygen evolution are explored in this study by investigating contact angle, morphology and electrochemical characteristics. The hydrophobicity of electrodes is measured by the contact angle of the PTFE-modified Ru 0.3 Ti 0.7 O 2 electrodes. The morphologies of electrodes with various amounts of PTFE are observed by using a scanning electron microscope (SEM) and an atomic force microscope (AFM). The effects of PTFE-content on the electrochemical characteristics of PTFE-modified electrodes are evaluated by the measurements of voltammetric charge, polarization and ac-impedance. The behavior of oxygen evolution and the performance of electrodes depende significantly on the hydrophobicity of PTFE-modified electrodes. The electrode prepared from a dipping solution with 21.1 vol% PTFE have the best performance in terms of the largest number of active sites and the highest site activity. The variation in performance of electrodes for oxygen evolution with PTFE-content is related to the variation in active site dispersion, morphology and bubble behaviors of the electrode.

Surface modification of co-evaporated thin films upon oxygen and air exposure

“…The oxide layer on Ti film does increase but without affecting the output of Eqs. (2) and (3). These equations reflect the average Ti oxide composition (i.e.…”

“…doi:10.1016/j.susc.2005.08.001 TiO 2 are the preferred ones, as it is expected that the resulting materials will show the catalytic properties of Ru and the well-known corrosion resistance properties of Ti (and TiO 2 ). Such Ru-RuO 2 -Ti-TiO 2 systems have been studied as electrocatalysts for H 2 and O 2 gas evolution [1,2], organic compounds electro-oxidation [3][4][5], and even electrodes for microcircuitry [6]. All these applications require stable, corrosion-resistant materials.…”