Abstract

The behavior of copper ion-exchange composites with metal particles of various sizes and contents in the electroreduction of oxygen dissolved in water have been studied. The primary size effect is significant for samples with low metal capacity: the smaller the metal particle size, the higher the process rate. At the same time, for samples with high metal capacity, the process occurs at approximately the same rate on copper particles obtained using different reducing agents due to the comparable size. A secondary size effect is observed due to the collective interaction of metal particles. The size effect was taken into account along with the effect of the content of metal particles using the proposed nanosized complex, which represents the ratio of capacity and size. At the level of electronic conductivity percolation, the nanosized complex reaches the limiting value corresponding to the highest degree of development of the reaction surface, which makes it possible to increase the current to the maximum current capacity. The reduction of oxygen occurs along several routes: electroreduction on copper particles, mainly on the surface of nanocomposite grains; and autocatalytic chemical reaction with electroregenerated metal nanoparticles in the nanocomposite grains. The electroreduction of oxygen generally reaches an intense steady-state mode.

中文翻译：

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离子交换基质中铜纳米颗粒的尺寸和含量对水中溶解氧的强稳态电还原的影响

摘要

研究了不同尺寸和含量金属颗粒的铜离子交换复合材料在电解还原水中溶解氧时的行为。对于金属容量低的样品，初级尺寸效应非常显着：金属颗粒尺寸越小，加工速率越高。同时，对于具有高金属容量的样品，由于尺寸相当，使用不同还原剂获得的铜颗粒上该过程以大致相同的速率发生。由于金属颗粒的集体相互作用，观察到二次尺寸效应。使用所提出的纳米复合物考虑了尺寸效应以及金属颗粒含量的影响，这代表了容量和尺寸的比率。在电子传导渗透水平上，纳米复合物达到了与反应表面最高发育程度相对应的极限值，这使得将电流增加到最大电流容量成为可能。氧的还原通过多种途径发生：铜颗粒上的电还原，主要发生在纳米复合材料颗粒的表面；以及与纳米复合材料颗粒中的电再生金属纳米颗粒的自催化化学反应。氧的电还原通常达到强烈的稳态模式。