Transition metal dichalcogenides (TMDCs) have garnered much attention recently due to their remarkable performance for different electrochemical systems. In this study, we report on the synthesis and catalysis of less studied TMDC nanoflakes (NFs) with a design space comprised of three transition metals (rhenium, ruthenium, and iridium) and three chalcogens (sulfur, selenium, and tellurium) for the oxygen reduction and evolution reactions (ORR and OER) in an aprotic hybrid electrolyte containing 0.1 M lithium bis(trifluoromethanesulfonyl)imide salt in 1-ethyl-3-methylimidazolium tetrafluoroborate ionic liquid and dimethyl sulfoxide. Our results indicate that among the tested catalysts, ReS₂ exhibits the highest current density for both ORR and OER, beyond those of the state-of-the-art catalysts used in aprotic media with Li salts. We performed density functional calculations to provide a mechanistic understanding of the reactions in the ReS₂ NFs/ionic liquid system. These novel bifunctional catalyst results could open a way for exploiting the unique properties of these materials in Li–O₂ batteries as well as other important electrochemical systems.

中文翻译：

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高活性R，钌和铱基双硫属元素化物电催化剂，用于在非质子性介质中进行氧还原和氧释放反应

过渡金属二硫化碳（TMDCs）由于其在不同电化学体系中的卓越性能，近来备受关注。在这项研究中，我们报告了设计空间由三种过渡金属（r，钌和铱）和三种硫的硫属元素（硫，硒和碲）组成的，研究较少的TMDC纳米片（NFs）的合成和催化作用。非质子混合电解质中的还原反应和析出反应（ORR和OER），该电解质在1-乙基-3-甲基咪唑四氟硼酸酯离子液体中含有0.1 M双（三氟甲磺酰基）酰亚胺锂盐和二甲基亚砜。我们的结果表明，在测试的催化剂中，ReS ₂在ORR和OER方面均表现出最高的电流密度，超过了在非质子介质中与Li盐一起使用的最新催化剂的电流密度。我们进行了密度函数计算，以提供对ReS ₂ NFs /离子液体系统中反应的机械理解。这些新颖的双功能催化剂结果可能为利用Li-O ₂电池以及其他重要电化学系统中这些材料的独特性能开辟道路。