Most of the practical applications in electrocatalysis require porous electrodes, built by dispersing the nanoparticles (NPs) on a gas diffusion layer, as carbon paper (CP). The lack of correlation between classic measurements in clean, controlled surfaces and thin films with those of porous electrodes, used in practical application, is largely neglected. Since catalysis depends on the area available, it is clear that the distribution of the NPs on the porous material is pivotal to the efficiency of the catalyst. Here we show a low‐cost method to disperse NPs on CP assisted in ultrasonic bath. Such method improves the Pt/C NPs distribution over the CP compared to the immersion method. As proof‐of‐concept, we show an increase in output current by using Pt/C/CP for 10 mM glucose electrooxidation and O₂ eletroreduction in buffered solution at 37 °C, which is ascribed to the increase in collision factor. Furthermore, the cathodic reaction is facilitated compared to electrodes prepared by immersion, yielding an unprecedented open circuit voltage of 800 mV for the coupled reaction. The glucose/oxygen reaction is also investigated in passive flow in an H‐type cell to produce power. This concept shows promising application to build any kind of porous electrodes with improved area utilization.

中文翻译：

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超声浴制备活性多孔电极及其在葡萄糖/ O2电化学反应中的应用

电催化中的大多数实际应用都需要多孔电极，该多孔电极是通过将纳米颗粒（NPs）分散在气体扩散层上而形成的，如碳纸（CP）。实际应用中，在干净，可控的表面和薄膜与多孔电极的经典测量之间缺乏典型的关联，这在很大程度上被忽略了。由于催化作用取决于可用的面积，因此很明显，NPs在多孔材料上的分布对于催化剂的效率至关重要。在这里，我们展示了一种低成本的方法，可在超声浴辅助下将NP分散在CP上。与浸没法相比，这种方法改善了CP上的Pt / C NPs分布。作为概念验证，我们证明了通过使用Pt / C / CP进行10 mM葡萄糖电氧化和O ₂输出电流的增加在37°C的缓冲溶液中进行电还原，这归因于碰撞系数的增加。此外，与通过浸没制备的电极相比，阴极反应更加容易，从而为偶合反应产生了前所未有的800 mV的开路电压。还在H型电池的被动流动中研究了葡萄糖/氧气反应以产生能量。该概念显示出有希望的应用，以构建具有改善的面积利用率的任何种类的多孔电极。