Metal oxide anode electrocatalysts are important for an effective removal of contaminants and the enhancement of electrode durability in the electrochemical oxidation process. Herein, we report the enhanced lifetime of RuO_x−TiO₂ composite anodes that was achieved by optimizing the fabrication conditions (e.g., the Ru mole fraction, total metal content, and calcination time). The electrode durability was assessed through accelerated service lifetime tests conducted under harsh environmental conditions, by using 3.4% NaCl and 1.0 A/cm². The electrochemical characteristics of the anodes prepared with metal oxides having different compositions were evaluated using cyclic voltammetry, electrochemical impedance spectroscopy, and X-ray analyses. We noticed that, the larger the Ru mole fraction, the more durable were the electrodes. The RuO_x−TiO₂ electrodes were found to be highly stable when the Ru mole fraction was >0.7. The 0.8RuO_x−0.2TiO₂ electrode was selected as the one with the most appropriate composition, considering both its stability and contaminant treatability. The electrodes that underwent a 7-h calcination (between 1–10 h) showed the longest lifetime under the tested conditions, because of the formation of a stable Ru oxide structure (i.e., RuO₃) and a lower resistance to charge transfer. The electrode deactivation mechanism that occurred due to the dissolution of active catalysts over time was evidenced by an impedance analysis of the electrode itself and surface elemental mapping.

金属氧化物阳极电催化剂对于有效去除污染物和增强电化学氧化过程中的电极耐久性很重要。本文中，我们报告了通过优化制造条件（例如，Ru摩尔分数，总金属含量和煅烧时间）实现的RuO _x -TiO ₂复合阳极寿命的延长。通过在苛刻的环境条件下使用3.4％NaCl和1.0 A / cm ²进行的加速使用寿命测试来评估电极的耐用性。使用循环伏安法，电化学阻抗谱和X射线分析评估了由具有不同组成的金属氧化物制备的阳极的电化学特性。我们注意到，Ru摩尔分数越大，电极越耐用。当Ru摩尔分数> 0.7时，发现RuO _x -TiO ₂电极高度稳定。考虑到其稳定性和污染物可处理性，选择0.8RuO _x -0.2TiO ₂电极作为具有最合适组成的电极。由于形成了稳定的Ru氧化物结构（即RuO），经过7h煅烧（在1-10h之间）的电极在测试条件下显示出最长的寿命。₃）和较低的电荷转移阻力。通过电极本身的阻抗分析和表面元素图可以证明由于活性催化剂随时间的溶解而发生的电极失活机理。