We report a systematic study of the influence of the composition and preparation method of the electrocatalyst layer deposited on the rotating (ring) disk electrodes (RDE/RRDE) employed in the alkaline oxygen reduction reaction (ORR). To investigate and rationalize the generally underestimated role of these factors on the ORR performance of mesoporous electrocatalysts, we studied the activity and selectivity of nitrogen‐doped ordered mesoporous carbon as a function of the loading of electrocatalyst and of binder, of the type of binder, and of the addition order of the components onto the electrode. The use of an anion‐exchange polymer (Fumion FAA‐3®) as the binder instead of the commonly employed Nafion® increased the selectivity towards H₂O₂ and led to a lower kinetic current density. In addition, higher selectivity towards H₂O was observed when increasing the loading of the catalyst and of the binder, although the latter resulted in a decreased kinetic current density. These results prove the crucial effect of the composition and preparation method of the layer deposited on the electrode on the ORR performance of the mesoporous electrocatalyst and can provide useful guidelines in view of the translation of the results of RDE studies to an alkaline fuel‐cell setup.

中文翻译：

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圆盘电极的组成和制备对碱氧还原反应中介孔电催化剂性能的影响

我们报告了沉积在碱性氧还原反应（ORR）中使用的旋转（环形）圆盘电极（RDE / RRDE）上的电催化剂层的组成和制备方法的影响的系统研究。为了研究这些因素在介孔电催化剂的ORR性能方面普遍被低估的作用并使之合理化，我们研究了氮掺杂有序介孔碳的活性和选择性与电催化剂和粘结剂负载量，粘结剂类型的关系，以及成分在电极上的添加顺序。使用阴离子交换聚合物（FumionFAA-3®）作为粘合剂代替常用的Nafion®提高了对H ₂ O ₂的选择性并导致较低的动电流密度。另外，当增加催化剂和粘合剂的负载量时，观察到对H ₂ O的更高的选择性，尽管后者导致动电流密度降低。这些结果证明了沉积在电极上的层的组成和制备方法对介孔电催化剂的ORR性能具有至关重要的影响，并且可以将RDE研究结果转化为碱性燃料电池设置提供有用的指导。