The optimization of the catalysts incorporated to the electrodes for anion exchange membrane water electrolysers is a key issue to maximize their performance through the improvement of the oxygen evolution reaction (OER) yield. In this work, we show that the modification of the microstructure and the chemical properties of a mixed copper-cobalt oxide anode may contribute to increase the activity of this reaction. For this purpose, the OER has been systematically studied, either in a half cell or in a membrane electrode assembly configuration, as a function of the load and agglomeration degree of the catalysts used as electrodes, as prepared on a carbon paper support by magnetron sputtering deposition in an oblique angle configuration. Chemical analysis by X-ray absorption spectroscopy and electrochemical analysis by cyclic voltammetry and impedance spectroscopy have shown that cobalt-copper mixed oxide catalysts with a 1.8 Co/Cu atomic ratio and about one micron equivalent thickness maximizes the cell performance. The chemical, structural and microstructural factors controlling the final behaviour of these anodes and accounting for this maximization of the reaction yield are discussed on the basis of these characterization results and as a function of preparation variables of the electrodes and operating conditions of the cell.

结合到阴离子交换膜水电解槽电极上的催化剂的优化是关键的问题，可通过改善氧释放反应（OER）的产率来最大化其性能。在这项工作中，我们表明混合铜钴氧化物阳极的微观结构和化学性质的改变可能有助于增加该反应的活性。为此，已对半电解池或膜电极组件配置中的OER进行了研究，该研究是通过磁控溅射在碳纸载体上制备的，作为用作电极的催化剂的负载和附聚度的函数以倾斜角度配置沉积。通过X射线吸收光谱的化学分析以及通过循环伏安法和阻抗光谱的电化学分析表明，具有1.8 Co / Cu原子比和约1微米当量厚度的钴-铜混合氧化物催化剂使电池性能最大化。在这些表征结果的基础上，并根据电极的制备变量和电池的工作条件，讨论了控制这些阳极的最终行为并解释反应产率最大化的化学，结构和微观结构因素。