Abstract

The electroreduction of oxygen on thin-film metal–polymer nanocomposites that differ in the metal (Ag, Cu, Pd), content, particle size of the metal component, and ionic form of the Lewatit K2620 matrix (H⁺, Na⁺) was studied. The limiting oxygen diffusion current and effective number of electrons involved in oxygen electroreduction were determined. The limiting current and the number of electrons increased with the content of metal nanoparticles and transition to larger nanoparticles. The oxygen electroreduction occurs by the four-electron mechanism, whereby the hydrogen peroxide intermediate product does not accumulate, and oxygen is reduced directly to water molecules. The electrochemical reduction of the metal oxidation products and hydrogen evolution can be observed depending on the ionic form of the matrix.

中文翻译：

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金属离子交换剂纳米复合材料的电化学活性

摘要

薄膜金属-聚合物纳米复合材料上的氧的电还原，其在金属（Ag，Cu，Pd），含量，金属组分的粒径和Lewatit K2620基质的离子形式（H ⁺，Na ⁺）进行了研究。确定极限氧扩散电流和参与氧电还原的有效电子数。极限电流和电子数量随金属纳米颗粒的含量增加而过渡到更大的纳米颗粒。氧的电还原是通过四电子机理发生的，因此过氧化氢中间产物不会积累，并且氧直接还原为水分子。取决于基质的离子形式，可以观察到金属氧化产物的电化学还原和氢逸出。