The electrochemical and corrosion characterization of Ti_0.97Ru_0.03O₂/Ti electrodes modified with WO₃ was reported. Modification of Ti_0.97Ru_0.03O₂/Ti electrodes with WO₃ was previously described as improving the effectiveness of an azo dye degradation in a photoelectrochemical treatment. Thus, the effect of WO₃ introduction to oxide film on electrode surface on electrochemical behaviour and stability of the modified electrodes was investigated. Moreover, corrosion behaviour of Ti_0.97Ru_0.03O₂/Ti electrodes modified with WO₃ was evaluated with the application of potentiodynamic polarization sweep method and open circuit potential measurement. Electrodes modified with WO₃ revealed higher anodic and cathodic peak currents in K₄[Fe(CN)₆] solution (by 35% for 6%WO₃ content) indicating higher electroactive surface area and faster electron transfer reaction. An increase in WO₃ amount in the oxide layer caused an increase in the number of active sites determined in Na₂SO₄ and most of them (more than 80%) were located in the outer and more accessible surface. The investigation of the tested electrodes at high potentials at which oxygen evolution is observed, allowed their classification in the following order showing an increase in their activity towards oxygen evolution reaction: Ti_0.97Ru_0.03O₂/Ti < Ti_0.94Ru_0.03O₂-W_0.03O₃/Ti < Ti_0.91Ru_0.03O₂-W_0.06O₃/Ti. Although the electrode modification with WO₃ resulted in lower resistance to corrosion in Na₂SO₄ solution regarding corrosion potential, corrosion current densities were clearly lower in comparison with the non-modified electrode, especially after longer immersion in the solution. ASTs showed that even a small addition of WO₃ increased the lifetime of the electrodes. The Ti_0.97Ru_0.03O₂/Ti electrode modification with WO₃ seemed to be advantageous for their application in electrochemical and photoelectrochemical degradation of organic pollutants.

Graphical Abstract

报道了用WO ₃改性的Ti _0.97 Ru _0.03 O ₂ / Ti电极的电化学和腐蚀特性。先前描述了用WO ₃修饰Ti _0.97 Ru _0.03 O ₂ / Ti电极是为了提高光电化学处理中偶氮染料降解的效率。因此，研究了在电极表面上的氧化膜中引入WO ₃对修饰电极的电化学行为和稳定性的影响。此外，WO改性的Ti _0.97 Ru _0.03 O ₂ / Ti电极的腐蚀行为用电位动极化扫描法和开路电位测量法对图₃进行了评价。用WO ₃修饰的电极在K ₄ [Fe（CN）₆ ]溶液中显示出更高的阳极和阴极峰值电流（6％WO ₃含量为35％），表明更高的电活性表面积和更快的电子转移反应。氧化物层中WO ₃量的增加导致在Na ₂ SO _4中确定的活性位点数量增加并且大多数（超过80％）位于外部且更易于接近的表面。在高电势处析氧观察到被测试电极的调查，允许它们的分类按以下顺序示出了朝向析氧反应的增加在它们的活性：钛_0.97钌_0.03 Ò ₂ / Ti的<钛_0.94钌_0.03 Ò ₂ - W _0.03 O ₃ / Ti <Ti _0.91 Ru _0.03 O ₂ -W _0.06 O ₃ / Ti。尽管用WO ₃修饰电极导致Na的耐腐蚀性降低₂ SO ₄溶液在腐蚀电位，腐蚀电流密度方面明显低于未改性电极，尤其是在溶液中浸泡更长的时间之后。ASTs表明，即使少量添加WO ₃也会增加电极的寿命。用WO ₃改性Ti _0.97 Ru _0.03 O ₂ / Ti电极似乎有利于它们在有机污染物的电化学和光电化学降解中的应用。

图形概要