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Evaluating the Effect of WO 3 on Electrochemical and Corrosion Properties of TiO 2 -RuO 2 - Coated Titanium Anodes with Low Content of RuO 2
Electrocatalysis ( IF 2.7 ) Pub Date : 2020-06-27 , DOI: 10.1007/s12678-020-00615-w
Elzbieta Kusmierek

The electrochemical and corrosion characterization of Ti0.97Ru0.03O2/Ti electrodes modified with WO3 was reported. Modification of Ti0.97Ru0.03O2/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 Ti0.97Ru0.03O2/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: Ti0.97Ru0.03O2/Ti < Ti0.94Ru0.03O2-W0.03O3/Ti < Ti0.91Ru0.03O2-W0.06O3/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 Ti0.97Ru0.03O2/Ti electrode modification with WO3 seemed to be advantageous for their application in electrochemical and photoelectrochemical degradation of organic pollutants.

Graphical Abstract



中文翻译:

评价WO 3对低RuO 2含量的TiO 2 -RuO 2包覆的钛阳极的电化学和腐蚀性能的影响

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0.970.03 Ò 2 / Ti的<钛0.940.03 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

更新日期:2020-06-27
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